Correct Answer: B

Rationale: In the sentence, 'water that has evaporated remains in the sky,' the word 'remains' is functioning as a verb. It is describing the action of water staying in the sky in cloud form for a certain duration. Verbs are words that express actions, occurrences, or states of being, and in this case, 'remains' is indicating the state of the water being in the sky in cloud form. The other choices are incorrect: 'noun' refers to a person, place, thing, or idea; 'adjective' describes or modifies a noun; and 'adverb' typically modifies a verb, adjective, or another adverb, but in this sentence, 'remains' is not being modified by an adverb.

Correct Answer: D

Rationale: In this context, 'disciplines' refers to specific areas of study or fields of expertise. Therefore, the most appropriate synonym for 'disciplines' would be 'fields.' Options A, B, and C do not accurately convey the meaning of 'disciplines' in the given sentence. 'Locations' and 'regions' refer to physical places, while 'punishments' is entirely unrelated to the context of academic or professional fields of study.

Correct Answer: B

Rationale: The comma following 'Day' is used incorrectly. Commas are typically not used after single-word identifiers like 'Day' in a sentence unless they are part of a list. In this case, the holiday is referred to as 'Parents' Day,' where the apostrophe is used correctly to indicate possession. The comma following 'Day' is unnecessary and should be removed for proper punctuation. Choices A and D both use apostrophes correctly to indicate possession, so they are not incorrect. The comma following 'Congo' in choice C is necessary to set off the introductory phrase 'a public holiday in the Democratic Republic of Congo.' Therefore, the correct answer is B.

Correct Answer: B

Rationale: In the sentence, 'water that has evaporated remains in the sky,' the word 'remains' is functioning as a verb. It is describing the action of water staying in the sky in cloud form for a certain duration. Verbs are words that express actions, occurrences, or states of being, and in this case, 'remains' is indicating the state of the water being in the sky in cloud form. The other choices are incorrect: 'noun' refers to a person, place, thing, or idea; 'adjective' describes or modifies a noun; and 'adverb' typically modifies a verb, adjective, or another adverb, but in this sentence, 'remains' is not being modified by an adverb.

Correct Answer: C

Rationale: Option C is the correct answer because it disrupts the flow of the sentence and introduces unnecessary information. The phrase 'over the years since 1958' is irrelevant in this context and does not contribute to the intended meaning of the sentence. The sentence is focused on the recent changes to the pension, not its historical evolution. Choices A, B, and D provide clear and concise ways to revise and combine the underlined portion of the sentences, maintaining a logical and relevant sentence structure.