Correct Answer: B

Rationale: The correct answer is B, 'He ate a lot on vacation, but he did not gain any weight.' The conjunction 'but' is used to show a contrast between the two clauses. Choices A, C, and D do not effectively demonstrate the contrast between eating a lot and not gaining weight, making them incorrect. Choice A introduces a conditional relationship that is not present in the original sentences. Choice C implies a causal relationship that is not intended. Choice D also suggests a causal link that is not appropriate given the context.

Correct Answer: C

Rationale: The correct plural of 'century' is 'centuries'. In English, to form the plural of most nouns ending in -y, you change the -y to -ies. Choice A, 'Centurys', is incorrect because it does not follow this rule. Choice B, 'Centures', is also incorrect as it does not provide the correct plural form. Choice D, 'Centuryies', is a completely incorrect and non-standard plural form of 'century'. Therefore, the correct answer is 'Centuries'.

Correct Answer: A

Rationale: The correct answer is A. The sentence is missing quotation marks around 'When is the assignment due?'. Quotation marks are essential to indicate that the words enclosed are being directly quoted. Choice B is incorrect because a semicolon is not needed in this context. Choice C is incorrect as a comma is already present after 'He asked' to separate the introductory clause. Choice D is incorrect because the sentence does lack proper punctuation, which are the quotation marks.

Correct Answer: D

Rationale: The correct answer is D (Henry) because the adjectives 'strong and healthy' describe 'Henry.' In this sentence, 'Henry' is the subject being described as strong and healthy, not 'weeks,' 'his,' or 'surgery.' While 'weeks' and 'surgery' are nouns mentioned in the sentence, they are not the nouns being described by the adjectives in question. 'His' is a possessive pronoun referring to Henry and does not match the criteria of being directly described by the adjectives 'strong and healthy.' Therefore, 'Henry' is the noun that the adjectives specifically describe in this context.

Correct Answer: D

Rationale: In the sentence 'I asked a colleague to bring it to you,' the pronoun 'whose' does not fit grammatically. The pronoun 'whose' is used to indicate possession or belonging to someone, which is not relevant in this context. The other pronouns 'my,' 'our,' and 'your' are all appropriate to use in this sentence based on the context of the sentence. Therefore, 'whose' is the correct answer as it does not work in the given sentence.