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A synonym is a word with a closely similar meaning. "Candid" describes someone who speaks openly and honestly, which matches "frank". The other choices describe caution, bad manners, or silence, none of which is openness of speech.
An antonym expresses a meaning contrary to the given word. "Transparent" means allowing light through so that objects behind can be seen, and "opaque" means light cannot pass through. The other options describe clarity, breakability, or texture and do not form a true contrast.
"Each" is a singular indefinite pronoun and always takes a singular verb. The plural noun that follows "of" does not change the number of the subject. Therefore the singular verb "is" is required.
The choice between "a" and "an" depends on the sound that begins the following word, not its spelling. "Honest" begins with a vowel sound because the "h" is silent, so "an" is used. The indefinite article is also correct here because the officer is not a specific one already known to the reader.
"Maintenance" is formed from the verb "maintain" but drops the "ai" of the stem and keeps the "e" before the final suffix. The standard spelling is therefore m-a-i-n-t-e-n-a-n-c-e. The other versions alter the vowel pattern or the final consonant cluster.
The preposition "at" is used with a specific measured level, rate, or point such as a height, temperature, or speed. Fixed collocations include "at a height of", "at a speed of", and "at 30,000 feet". The other prepositions do not combine with "height" in this way.
A pronoun that follows a preposition takes the objective case. "Between" is a preposition, so the objective form "me" is required. "I" and "we" are subjective forms, and "mine" is a possessive form.
The past simple "rang" establishes a past time frame, and the action in progress at that moment requires the past continuous. "Was working" correctly shows an ongoing past action interrupted by another event. The present and future forms do not match the past-time clause.
In a "neither ... nor" construction the verb agrees with the subject nearer to it. The nearer subject here is "engineers", which is plural, so the plural past verb "were" is correct. The singular forms would be right only if the nearer subject were singular.
The fixed expression is "to the point", meaning relevant and concise. Idiomatic expressions use set prepositions that cannot be changed by logic alone. Only "to the" completes the established idiom correctly.
When converting a simple past active sentence to the passive, the object becomes the subject and the verb becomes "was/were + past participle". The original tense, simple past, must be preserved. "Was repaired" matches the tense of "repaired" exactly.
In reported speech after a past reporting verb, the present tense shifts back to the past and time words shift accordingly. "Am" becomes "was" and "now" becomes "then". The continuous form "was being" is not used with the stative adjective "busy".
Context clues show that "meticulous" describes how an inspection is carried out. The word means showing great attention to detail and precision. Therefore "extremely careful" captures its meaning, while the others describe speed, neglect, or cost.
The relationship is between an item and the structure in which it is stored or housed. Aircraft are kept in a hangar just as grain is stored in a silo. A field, farmer, or loaf of bread does not name a storage structure.
"Abide" is followed by the preposition "by" when it means to obey or conform to something. This is a fixed verb-preposition combination that must be learned as a unit. The other prepositions do not form this collocation.
The clause "even his critics were convinced" shows that the argument was strong and persuasive. "Cogent" means clear, logical, and convincing, which fits the result described. The other adjectives describe weak, unclear, or boring arguments, which would not persuade opponents.
An appositive is a phrase that renames the noun beside it and must be set off by commas on both sides. The phrase "a veteran of many missions" renames "the pilot". Only the first option encloses it with a pair of commas.
This is a third conditional sentence, which describes an unreal past condition and its result. Its pattern is "if + past perfect, would have + past participle". Therefore "had overheated" is required.
"Affect" is a verb meaning to influence or have an impact on something. "Effect" is normally a noun meaning a result. Since a verb is needed here with the meaning "influence", "affect" is correct.
The relative pronoun must show possession of "members" by the squadron. "Whose" is the possessive relative pronoun and links the squadron to its members. The other relatives cannot express possession.
Verbs of ordering or requesting such as "ask that" take the subjunctive mood in the following clause. The subjunctive uses the base form of the verb regardless of tense or subject, so "be submitted" is correct. Indicative forms do not follow this construction.
"Because" is a conjunction and can correctly introduce a full clause with its own subject and verb. "Owing to" and "due to" are prepositional expressions and need a noun phrase, not a clause. Therefore "because it lacked" is the only grammatically sound replacement.
"Ephemeral" describes something that lasts for a very short time. Its opposite must describe something long-lasting, which is the meaning of "enduring". The other choices either repeat the idea of brevity or describe a different quality.
The correlative pattern with a negative adverb at the start is "hardly ... when". When "hardly" begins the sentence, inversion follows, and the second clause is introduced by "when". "Than" pairs with "no sooner", not with "hardly".
An introductory participial phrase must describe the subject of the main clause. In the first sentence the subject is "the logbook", which cannot perform the act of finishing checks, so the modifier dangles. In the other sentences the doer of the action is correctly named as the subject.
The grammatical subject of the sentence is the pronoun 'one', which is singular; the phrase 'of the aircraft's engines' is only a prepositional modifier and cannot change the verb's number. The past time marker 'during the last inspection' also requires a past tense.
The indefinite article is chosen by sound, not spelling: 'hour' begins with a vowel sound because the 'h' is silent, so 'an' is required. The noun is being introduced for the first time, which rules out the definite article.
'Succinct' describes language that is compressed and clear, conveying much in few words. It refers to economy of expression rather than to accuracy or secrecy.
'Scarce' means available in insufficient quantity, so its antonym must express abundance. 'Plentiful' is the only option that denotes a large, ample supply.
The adjective 'responsible' is followed by the fixed preposition 'for' when it introduces the duty someone oversees. This collocation is standard in both general and technical English.
The past perfect continuous is used for an action that had been continuing for a stated duration up to a point in the past. 'By the time the relief crew arrived' fixes that end point in the past, and 'for six hours' supplies the duration.
Verbs of demand, insistence and request (such as 'insist that') take the mandative subjunctive, whose form is the base verb for every subject. The bare 'attend' therefore appears even though the subject 'every trainee' is singular.
A relative pronoun replacing a human subject must be 'who'. In this sentence the engineer is the one who performed the designing, so the nominative form is needed.
Items in a series joined to the verb 'include' must share the same grammatical form, and the surrounding items are gerunds ('inspecting', 'maintaining'). A gerund phrase is therefore required for the middle item.
The main clause states a negative outcome, so the condition must be the non-fulfilment of the improvement. 'Unless' carries the meaning 'if not', which produces the intended logic.
'Advice' is an uncountable noun in English, so it has no plural form and takes no indefinite article. Quantity is expressed with partitives such as 'some', 'a piece of' or 'a word of'.
'Specious' describes reasoning or statements that look plausible on the surface yet are actually unsound. The word criticises superficial persuasiveness, not accuracy, relevance or tone.
The phrase 'for the time being' signals postponement, and the phrasal verb 'put off' means to delay something to a later time. The other phrasal verbs with 'put' carry unrelated meanings.
The construction 'It was not until ... that ...' is a fixed cleft pattern used to focus on the time at which something happened. Only 'that' completes this frame; the clause after it is a full statement, not a relative clause.
The verb 'deny' is followed by a gerund, never by an infinitive. When the denied action happened earlier than the denying, the perfect gerund 'having submitted' makes that sequence explicit.
Factorising requires two numbers whose product is +12 and whose sum is +7; those numbers are 3 and 4, giving (x − 3)(x − 4) = 0 and hence x = 3 or x = 4.
From the standard table of exact values, sin 30° = 1/2 and cos 60° = 1/2. Adding these gives 1.
By definition, log₁₀ N is the power to which 10 must be raised to give N. Since 10³ = 1000, the logarithm equals 3.
The nth term of an arithmetic progression is a + (n − 1)d. Substituting a = 3, d = 4 and n = 7 gives 3 + 6(4) = 27.
Differentiating sine gives cosine: d(sin x)/dx = cos x. The minus sign belongs to the derivative of cosine, not sine.
The favourable outcomes are 2, 4 and 6, so there are 3 favourable outcomes out of 6 equally likely outcomes. The probability is therefore 3/6 = 1/2.
For a 2 × 2 matrix [[a, b], [c, d]] the determinant is ad − bc. Here that is (2)(4) − (1)(3) = 8 − 3 = 5.
Powers of i repeat in a cycle of length four: i¹ = i, i² = −1, i³ = −i, i⁴ = 1. Since 25 = 4(6) + 1, i²⁵ = i¹ = i.
The sum of roots is α + β = 5/2 and the product is αβ = 3/2. Using α² + β² = (α + β)² − 2αβ gives 25/4 − 3 = 13/4.
In the first quadrant all ratios are positive, and cos θ = √(1 − 9/25) = 4/5. Then tan θ = sin θ / cos θ = (3/5)/(4/5) = 3/4.