Double Blank Fill in the Blanks
~22 min read · AFCAT English
- Pattern: One sentence with two blanks; each option is a pair of words. You must pick the pair where both words fit, not just one.
- Recurrence: About 0.75 questions per AFCAT paper — the lightest English topic, but still recurring and a near-guaranteed mark if you have the method.
- Core trick: Solve the easier blank first and eliminate option pairs by it. Never try to fit both blanks at the same time.
Overview
Double Blank Fill in the Blanks appears about 0.8 times per paper across the last four AFCAT solved papers, placing it in the solid add-on band of English.
Double-blank fill-in-the-blanks is the smallest slice of AFCAT English — averaging less than one question per paper across the solved papers from 2022 to 2025. Despite the low weight, it is a topic where a trained candidate scores while an untrained one loses time, because the format invites you to try both blanks at once and then guess.
The format is a single sentence with two gaps. Each of the four options gives you a pair of words separated by a slash or a comma. Only one pair makes the sentence work in meaning, direction and tone. The wrong pairs almost always have one word that fits and one that does not, which is exactly the trap.
This page gives you the full method: how AFCAT frames these items, pair-elimination as the default approach, how to read the sentence for direction (same-direction versus opposite-direction), how cause-and-effect chains drive paired choices, how to match register and tone across both blanks, how correlative connectors lock the pair, how verb pairs work, the common trap patterns, and a strict time budget. It also walks through ten original worked examples with the pair-elimination thought process spelled out.
Treat this topic as a quick win. One careful read of the method, ten to fifteen drills, and you will almost always cash the mark when it appears.
How AFCAT frames double-blank items
AFCAT double-blank items are short — usually one declarative sentence of fifteen to twenty-five words. The two blanks are separated by some logical structure: a connector, a verb, an adverb of contrast, or a cause-effect pivot like ‘so…that’ or ‘because’. The four options are word pairs of the same length and the same broad part of speech (two adjectives, two verbs, one adjective and one noun, and so on).
What the paper-setter is testing
- Vocabulary breadth on a moderate level — the words are not obscure, but you must know connotation (positive or negative shade).
- Direction sense — whether the second half of the sentence continues the first half or contrasts with it.
- Pair coherence — whether the two filled-in words belong to the same register, tone and timeline.
- Trap discipline — whether you reject pairs that have one perfect word and one wrong word.
Standard layout
The stem reads: ‘Fill in the two blanks with the most appropriate pair of words.’ The options look like this:
- (A) word1 / word2
- (B) word3 / word4
- (C) word5 / word6
- (D) word7 / word8
The slash separates the first-blank candidate from the second-blank candidate. Order matters — you cannot swap them inside an option.
The pair-elimination method
Pair-elimination is the default approach. It works because almost every wrong option has at least one obviously wrong word — solve the easier blank first and the wrong options fall away.
Four steps
- Read the whole sentence once. Do not fill anything yet. Note the overall direction, the tense, the tone and any signal words (contrast words, cause-effect markers, correlatives).
- Identify the easier blank. The easier blank is the one with more context around it — adjectives that describe a known noun, verbs that follow a clear subject, or words that sit next to a signal phrase such as ‘so that’ or ‘in order to’.
- Test the easier blank against each option pair. Strike out any pair whose easier-blank word does not fit. You will usually be down to two pairs.
- Use the harder blank to choose between the survivors. Read the sentence whole with each surviving pair in place; the wrong one will sound off in tone or direction.
Why not solve both at once
If you try to fit both blanks together, you have to hold four word candidates in your head while reading a long sentence. Mistakes follow. Solving one blank first reduces the load to two candidates, which is what your working memory handles well under exam pressure.
Same-direction vs opposite-direction blanks
Every double-blank sentence has a direction. The two blanks either pull the sentence the same way (both positive, both negative, both formal, both informal) or they pull against each other when a contrast word separates them. Reading direction correctly eliminates two options on its own most of the time.
Contrast vs same-direction connector table
| Signal word | Direction between the two halves | What the blanks must do |
|---|---|---|
| although, though, even though | Opposite | One blank positive, the other negative — or vice versa. |
| however, but, yet | Opposite | The second half reverses the first half; the second blank carries the opposite shade. |
| while, whereas | Opposite (compare-and-contrast) | The two blanks describe contrasting subjects or qualities. |
| despite, in spite of | Opposite | The second blank is unexpected given the first blank. |
| and, also, moreover, furthermore | Same | The two blanks reinforce each other. |
| because, since, as | Same (cause to effect) | The two blanks sit on the same side of a cause-effect arrow. |
| so, therefore, hence, thus | Same (effect from cause) | The second blank is the logical effect of the first. |
| so…that, such…that | Same (cause-effect intensifier) | The cause blank is strong; the effect blank is the predictable outcome. |
| (no signal word) | Same by default | Treat as same direction unless meaning forces a contrast. |
How to apply the table
Spot the signal word first. If it is a contrast word, only opposite-direction pairs survive. If it is a same-direction word or there is no signal, only same-direction pairs survive.
Example skeleton: ‘Although the report was ____, the committee found it ____.’ ‘Although’ forces an opposite pairing — perhaps ‘brief / comprehensive’ or ‘harsh / fair’. A pair like ‘brief / short’ pulls the same way and fails the contrast test.
Cause-and-effect chains; condition-and-result chains
Many double-blank items are built on a cause leading to an effect, or a condition leading to a result. The two blanks sit at the two ends of the arrow.
Pattern 1 — Cause to effect
Skeleton: ‘Because the briefing was ____, the trainees emerged ____.’
The first blank is the cause; the second is the effect. A clear cause produces a predictable effect. ‘Detailed / confident’ fits because a detailed briefing produces confident trainees. ‘Detailed / confused’ fails because the effect contradicts the cause.
Pattern 2 — Cause-effect intensifier
Skeleton: ‘The exam was so ____ that even the ____ candidates struggled.’
‘So…that’ amplifies the cause and predicts the effect. A strong negative cause (‘tough’) produces a surprising effect on a normally capable group (‘best-prepared’). The trap pair will have a weak cause word or a non-surprising effect word.
Pattern 3 — Condition to result
Skeleton: ‘If pilots are ____ during training, they perform ____ in combat.’
‘If’ creates a conditional. The condition word and the result word point the same way: ‘drilled / instinctively’ works; ‘drilled / hesitantly’ breaks the chain.
Pattern 4 — Concession with result
Skeleton: ‘Despite the ____ weather, the squadron remained ____.’
‘Despite’ creates concession. The blank inside the ‘despite’ phrase and the blank in the main clause point in opposite directions: ‘harsh / disciplined’ works because discipline is unexpected in harsh weather; ‘harsh / scattered’ fails because scattering is expected, not unexpected.
Vocabulary requirements and register matching
The two blanks must come from the same register — that is, the same level of formality and the same emotional shade. AFCAT options often include a pair where both words make literal sense but one is formal and the other is colloquial, or one is neutral and the other is loaded.
Register cues to scan for
- Subject of the sentence: A press release is formal; a personal note is informal. A military communique is clipped and neutral; a magazine column is warm.
- Verbs already present: ‘Stated’ pulls the sentence formal; ‘said’ keeps it neutral; ‘blurted out’ pulls it informal.
- Adjectives already present: ‘Distinguished’ is formal-positive; ‘nice’ is neutral; ‘cool’ is informal-positive.
Register-mismatch example
Sentence: ‘The minister’s remarks were ____ and the audience response was ____.’
Possible pairs: (A) measured / respectful (B) measured / awesome (C) cool / respectful (D) cool / awesome.
(A) is formal-formal and works. (B) and (C) mix registers — they are the trap pairs. (D) is informal-informal and may work in a casual context but does not fit a ministerial setting.
Connotation must also align
Even within the same register, the shade must match. ‘Frugal’ and ‘stingy’ both mean spending little, but ‘frugal’ is positive and ‘stingy’ is negative. In a double-blank praising a person, you would use ‘frugal / thrifty’, not ‘frugal / stingy’.
Logical connectors that need consistent fill
Some sentences contain correlative conjunctions — fixed pairs that always travel together. These structures lock the grammar and often the meaning of the two blanks.
Correlative pair table
| Correlative | Function | What it forces on the blanks |
|---|---|---|
| not only … but also | Addition with emphasis | Both blanks must be positive-additive; the second often outranks the first in strength. |
| either … or | Choice between two options | The two blanks are alternatives of the same kind (both nouns, both verbs). |
| neither … nor | Negation of both | The two blanks share a negative shade; both are rejected by the sentence. |
| both … and | Joint affirmation | The two blanks are co-equal; both must be acceptable choices. |
| as … as | Comparison of equality | The first blank sets the standard; the second confirms a match. |
| so … as to | Cause leading to extreme effect | Strong cause word; extreme effect word. |
| no sooner … than | Immediate sequence | Two actions in tight time order; second blank is in simple past. |
| hardly … when / scarcely … when | Almost-simultaneous events | Second blank is in simple past; first clause uses past perfect. |
Applying correlatives
If you see a correlative, treat it as a hard constraint. A pair that violates the correlative is out, even if both words look fine in isolation. For example, in ‘Not only was the candidate ____, but she was also ____,’ both blanks must be positive — a pair like ‘capable / inexperienced’ is automatically wrong because ‘but also’ requires reinforcement, not contradiction.
Two-adjective sentences — connotation must match
A common AFCAT pattern places both blanks as adjectives describing related things — usually one describing a cause and one describing a result, or both describing the same subject from two angles. The connotation of both adjectives must match the sentence’s overall judgement.
Positive-positive pattern
‘The pilot’s ____ landing in low visibility earned him ____ praise.’
Both adjectives must be positive: ‘skilful / unstinting’ or ‘deft / generous’. A pair like ‘careless / unstinting’ fails the first blank; ‘skilful / muted’ fails the second.
Negative-negative pattern
‘The report’s ____ analysis drew ____ reactions from the panel.’
Both adjectives must be negative: ‘shoddy / scathing’ or ‘sloppy / harsh’. A positive-negative mix breaks the pattern.
Mixed pattern (with contrast word)
‘The plan was ____ on paper but ____ in execution.’
‘But’ forces a swap of shade: ‘elegant / clumsy’ or ‘promising / disastrous’. A same-shade pair like ‘elegant / refined’ ignores ‘but’.
Verb-pair sentences
Some items put a verb in each blank. The verbs must agree in tense, subject, and the logic of the sentence.
Tense-pair table
| Sentence pattern | First blank tense | Second blank tense | Example |
|---|---|---|---|
| X did A, then X has done B (continuing relevance) | Simple past | Present perfect | ‘She joined the academy in 2019 and has since served as instructor.’ |
| X had done A before Y did B | Past perfect | Simple past | ‘The runway had cleared before the convoy arrived.’ |
| While X was doing A, Y did B | Past continuous | Simple past | ‘While the cadets were drilling, the inspector entered.’ |
| If X happens, Y will happen | Simple present | Simple future | ‘If the signal fails, the back-up activates.’ |
| X has been doing A since Y | Present perfect continuous | Simple past (in ‘since’ clause) | ‘He has been training since he qualified.’ |
| No sooner had X done A than Y did B | Past perfect (with ‘had’) | Simple past | ‘No sooner had the jet taken off than the radar lit up.’ |
Subject-verb agreement matters
A pair that is grammatically right but uses the wrong tense pair is wrong. If a sentence starts ‘By the time the rescue team arrived…’, the second blank must be past perfect (‘had collapsed’, not ‘collapsed’).
Tone-matching method
Tone is the writer’s attitude toward the subject. Even when register and direction agree, the tone of the two filled-in words must match the writer’s attitude.
Tone cue table
| Tone | Cue words in the sentence | Suitable blank words |
|---|---|---|
| Approving | commendable, admirable, exemplary, fine | positive adjectives, warm verbs |
| Disapproving | regrettable, unfortunate, lamentable, poor | negative adjectives, critical verbs |
| Neutral / factual | reported, noted, observed, recorded | neutral nouns and verbs |
| Ironic | so-called, supposedly, allegedly, ostensibly | words that quietly undercut the surface meaning |
| Cautious | perhaps, possibly, may, might, seem | hedged, qualified words |
| Urgent | immediately, at once, without delay | strong action verbs |
Tone in practice
If the sentence begins ‘Regrettably, the unit was…’, both blanks must carry a disapproving tone. A pair where the first blank is mildly negative and the second is positive (‘short-handed / well-led’) breaks the tone. The right pair is two negatives (‘short-handed / poorly-led’).
Common AFCAT double-blank patterns
From the solved papers and from AFCAT-style mocks, six structures recur. Recognising the structure is half the answer.
- Cause-effect with ‘so…that’ or ‘such…that’: First blank intensifies a cause; second blank describes the predictable effect on a normally resistant subject.
- Contrast with ‘although’ or ‘however’: Two halves of opposite shade; pick the pair that points in opposite directions.
- Two-adjective description: Both adjectives describe one subject from two angles; both must carry the same shade.
- Verb pair with time sequence: Two actions in a clear order; pick the pair whose tense order matches the time markers (‘before’, ‘after’, ‘by the time’, ‘since’).
- Correlative pair (‘not only…but also’ etc.): Both blanks must obey the correlative’s built-in logic.
- Concession with ‘despite’: First blank is a difficulty; second blank is an unexpected positive result.
Recognising the structure in five seconds
Before you read the options, finish reading the sentence and name the structure to yourself. ‘This is a cause-effect.’ ‘This is a contrast.’ ‘This is a correlative.’ Once named, you know which direction rule to apply.
Step-by-step pair-elimination rehearsal
This rehearsal walks through eight practice items in compressed form. Read the sentence, name the structure, pick the easier blank, eliminate, choose. The full worked examples follow in the next section.
Drill 1
‘The squadron leader’s ____ briefing left the cadets feeling ____.’ Structure: cause-effect, same direction. Easier blank: second (the feeling follows the briefing). If the briefing was ‘crisp’, the cadets feel ‘confident’. Eliminate any pair where the second word is negative.
Drill 2
‘Although the runway was ____, the pilot landed ____.’ Structure: contrast. Easier blank: first (describes the runway physically). ‘Slippery’ fits. The second blank must then surprise — ‘safely’, not ‘crashed’.
Drill 3
‘No sooner had the alarm ____ than the unit ____ for action.’ Structure: correlative with tense. First blank: past participle after ‘had’. Second blank: simple past. ‘Sounded / mobilised’.
Drill 4
‘The minister’s ____ remarks drew ____ applause from the gathering.’ Structure: two-adjective, same shade. If remarks are ‘stirring’, applause is ‘thunderous’.
Drill 5
‘Despite the ____ weather, the team remained ____.’ Structure: concession. First blank: difficulty. Second blank: surprising resilience. ‘Bitter / cheerful’.
Drill 6
‘Not only was the proposal ____, it was also ____.’ Structure: correlative addition. Both blanks positive (or both negative if the sentence has a negative frame). ‘Bold / practical’.
Drill 7
‘The instructor ____ the formation and the cadets ____ in silence.’ Structure: parallel verbs. Same tense. ‘Explained / listened’ — not ‘explained / will listen’.
Drill 8
‘The report was ____ in length but ____ in substance.’ Structure: contrast within one subject. ‘Brief / thorough’ — opposite shades.
Trap patterns
The AFCAT setter builds wrong options by changing one word, not both. Spot the trap and you avoid the wrong pick.
Trap 1 — One word fits, the partner does not
Two of the four options will contain the obviously right word for the easier blank. Of these two, only one will have the right partner for the harder blank. Test both partners before committing.
Trap 2 — Both words fit literally, but the tone is off
Both options may make grammatical sense, but one breaks the register. Example: in a formal sentence about a court ruling, ‘ridiculous / silly’ may be literally fine but is too colloquial; ‘unsound / questionable’ matches the register.
Trap 3 — Direction reversed
The setter offers a pair that fits a sentence without a contrast word, but the actual sentence has ‘although’. Read for the signal word before you read the options.
Trap 4 — Mismatched connotation
Two synonyms with opposite shades — ‘frugal / stingy’, ‘confident / arrogant’, ‘firm / stubborn’ — placed together so that one praises the subject and the other criticises it. Reject if the sentence has one consistent attitude.
Trap 5 — Tense pair broken
The first blank is a verb that fits but the second blank is in the wrong tense. ‘No sooner had he arrived / he leaves’ breaks the tense pair.
Trap 6 — Plausible single-word filler
The pair includes a word that is a common single-blank answer in vocabulary exercises but does not match the partner. The reflex is to grab the familiar word; resist until the partner has been tested.
Time budget
AFCAT gives 120 minutes for 100 questions — about 72 seconds per question on average. English questions need to come in well under that to leave time for the heavier reasoning and military-aptitude sections.
Suggested split for double-blanks
- 0–10 seconds: Read the sentence whole; name the structure (cause-effect, contrast, correlative, etc.).
- 10–25 seconds: Pick the easier blank and eliminate two options against it.
- 25–45 seconds: Read the sentence whole with each surviving pair; pick the better fit.
- 45–55 seconds: Mark and move on.
Maximum time per item: 60 seconds. If you cross 60 seconds, mark a best guess and flag the question for review.
When to skip
If after the first read you cannot name the structure and you do not know two of the four word pairs, skip the question. With negative marking at minus one, a true unknown is best left blank rather than guessed cold. Come back only if time permits at the end.
Expected accuracy
With the method, target 80 percent accuracy on double-blanks in practice and 90 percent in the actual paper, where you usually see only one such item.
Worked AFCAT-style examples
Fill the two blanks: The veteran’s ____ account of the operation left the audience visibly ____.
Structure: cause to effect, same direction. Easier blank: the second (audience reaction follows the account). The sentence implies a strong effect (‘visibly ____’), so the cause must be strong and positive. ‘Gripping / moved’ matches. ‘Dull / excited’ reverses the direction. ‘Long / bored’ is plausible but the cause-effect link is weak, and ‘visibly bored’ does not fit ‘veteran’s account of the operation’. ‘Brief / confused’ has no causal link.
Fill the two blanks: Although the budget was ____, the project was completed ____.
Structure: contrast (‘although’). The first half must oppose the second. Easier blank: first (describes the budget). ‘Tight’ is a difficulty; ‘generous’ is not. Pairs (C) and (D) start with ‘generous’ and so the second half is not a surprise — they break the contrast. Of (A) and (B), ‘on schedule’ is the genuinely surprising completion under a tight budget; ‘hurriedly’ is expected under a tight budget, so it does not surprise. (A) holds.
Fill the two blanks: The instructor’s tone was so ____ that even the ____ recruits paid attention.
Structure: ‘so…that’ — strong cause produces a surprising effect on a normally resistant group. Easier blank: the second (modifies ‘recruits’ who would otherwise not pay attention). ‘Restless’ recruits do not normally pay attention, so a ‘commanding’ tone explains why they did. ‘Keen’ recruits always pay attention — no surprise. ‘Curious’ recruits also pay attention naturally. ‘Sleepy / vague’ has a weak cause.
Fill the two blanks: The report was ____ in its findings and ____ in its recommendations.
Structure: two-adjective same-direction (‘and’ joins, no contrast word). Both blanks must share the same shade. (A) and (D) mix opposite shades — vague vs specific, harsh vs kind — without a contrast signal, so they fail. (C) starts well but ends negative against a positive start. (B) is consistent: clear findings and specific recommendations are both positive qualities.
Fill the two blanks: Despite the ____ terrain, the column moved forward with ____ discipline.
Structure: concession (‘despite’). The terrain blank must be a difficulty; the discipline blank must be unexpectedly strong given that difficulty. ‘Rough / iron’ fits. ‘Easy / poor’ has no concession — easy terrain does not need a despite. ‘Flat / strict’ is similar — flat terrain is not a difficulty. ‘Rough / shaky’ matches the terrain but ‘shaky’ discipline is expected on rough terrain, so it breaks the surprise.
Fill the two blanks: No sooner had the siren ____ than the cadets ____ to their posts.
Structure: correlative ‘no sooner had…than’ — first blank past participle (after ‘had’), second blank simple past. (A) is grammatically correct. (B) breaks tense with the future. (C) uses the wrong form after ‘had’. (D) breaks both grammar slots.
Fill the two blanks: The plan looked ____ on paper but proved ____ on the ground.
Structure: contrast within one subject (‘but’). Opposite shades required. (A) and (B) repeat the same shade — both positive — and so fail ‘but’. (D) repeats negative-negative and is meaningless because ‘rough on paper’ would not turn ‘harsh on the ground’; both halves point the same way. (C) gives the required swap from positive to negative.
Fill the two blanks: Not only was the recruit ____, but she was also ____.
Structure: ‘not only…but also’ is a same-direction correlative. Both blanks must share the same shade. (A), (C) and (D) mix shades and so break the correlative. (B) places two positive qualities in addition to each other, which is what ‘but also’ requires here.
Fill the two blanks: By the time the rescue team ____ the area, the floodwaters ____ the lower huts.
Structure: ‘by the time + past, past perfect.’ The earlier action takes past perfect; the later marker takes simple past. (A) and (D) break tense. (C) mixes present with past. (B) is the tense pair the construction demands.
Fill the two blanks: The auditor’s ____ review uncovered ____ irregularities in the accounts.
Structure: cause to effect, same direction. A thorough review produces the discovery of serious irregularities (the depth of review uncovers the depth of trouble). (A) is contradictory — a casual review rarely uncovers serious problems. (B) understates — a thorough review uncovering only minor issues is not what the sentence implies. (D) is grammatically awkward (‘no irregularities’ would not be uncovered, it would be confirmed absent).
Fill the two blanks: The veteran spoke with ____ pride about the regiment’s ____ record.
Tone match. ‘Quiet pride’ pairs with an ‘unbeaten record’ — a calm, dignified description of a strong achievement. ‘Loud / patchy’ mismatches: loud pride about a patchy record sounds boastful. ‘False / glorious’ contradicts (false pride about a glorious record makes no sense). ‘Quiet / patchy’ has matching register but no reason to be proud.
Fill the two blanks: The committee’s decision was ____, leaving even its supporters ____.
‘Even its supporters’ signals an unexpected reaction. The decision must be of a kind that confuses people who usually agree with it. ‘Baffling / confused’ fits. ‘Popular / pleased’ is expected, not unexpected. ‘Routine / surprised’ is contradictory. ‘Fair / angry’ would surprise but ‘fair’ rarely makes supporters angry; the cause-effect link is weak.
Exam-day strategy
- Always read the whole sentence first; name the structure (cause-effect, contrast, correlative, concession, two-adjective, verb pair) before glancing at the options.
- Identify the easier blank — the one with more context around it — and solve that first.
- Eliminate option pairs by the easier blank; you will usually be down to two surviving pairs.
- Use the harder blank to choose between the survivors by reading the full sentence with each pair in place.
- Spot contrast words (although, however, but, yet, while, whereas, despite) and demand opposite shades when they appear.
- Treat correlative pairs (not only…but also; either…or; neither…nor; both…and; no sooner…than) as hard grammatical constraints.
- Match tense across the verb pair; mismatched tenses kill an otherwise plausible answer.
- Match register: a formal sentence demands formal partners in both blanks.
- Match connotation: in a praising sentence, both blanks must be positive; in a critical sentence, both must be negative — unless a contrast word is present.
- Cap time at 60 seconds per item; if undecided, mark the best guess and move on.
- Skip cold-unknown items rather than guess; minus-one negative marking punishes wild guesses on a low-frequency topic.
- Drill ten to fifteen original double-blank items during preparation; this is enough to build the reflex without overspending on a 0.75-per-paper topic.
Practise Double Blank Fill in the Blanks for AFCAT
Drill AFCAT-pattern double-blank items with full pair-elimination walkthroughs and direction-matching practice.
Start free AFCAT practiceFrequently asked questions
How many double-blank items appear in an AFCAT paper?
About 0.75 per paper on average — the lightest English topic. Across the four solved papers from 2022 to 2025 the count was three. Plan for one such item per paper, no more.
How much study time should I spend on double-blanks?
An hour at most. Read the method, drill ten to fifteen original items, review your wrong picks, and move on to the heavier topics like reading comprehension, synonyms and idioms.
Are both blanks always linked in meaning?
Yes. The two blanks together complete the sentence’s logical chain — cause and effect, condition and result, contrast pair, two-angle description, correlative match or tense sequence. Solving them in isolation usually leads to the trap pair.
Which blank should I solve first?
The easier one — the blank with more context around it, or the one closest to a signal word (although, so…that, despite, no sooner…than). If both look equally easy, start with the second blank, because setters more often place the trap word in the first blank.
What if two option pairs look right after elimination?
Read the full sentence with each pair in place and listen for tone, register and direction. The wrong survivor almost always has a partner word that is one shade off — slightly too informal, slightly too negative, or slightly off-tense.
Do double-blanks ever use a contrast word in the middle?
Yes. ‘Although’, ‘however’, ‘but’, ‘yet’, ‘while’, ‘whereas’ and ‘despite’ are the most common. When you see one, the two blanks must point in opposite directions; reject any same-shade pair.
Should I guess if I am unsure?
Only if you can eliminate at least two of the four pairs with high confidence. With minus-one negative marking and only 0.75 expected questions on this topic per paper, a cold guess is more likely to cost you than to gain you.
Is the level of vocabulary very high?
No. Most words sit at the SSC CGL Tier-1 band — moderate, not obscure. The challenge is matching connotation and direction, not unlocking rare words.