Correct Answer: D

Rationale: In the sentence, 'The nurses went to the conference room,' 'nurses' is the subject. The subject of a sentence is typically the noun or pronoun that carries out the action or is described in the sentence. In this case, 'nurses' is the noun performing the action of going to the conference room. Choices A, B, and C are not the subject. 'Conference' and 'room' are objects of the prepositions 'to' and 'the,' while 'went to' is the verb phrase indicating the action performed by the subject.

Correct Answer: A

Rationale: In this sentence, the correct choice is 'swam,' which is the past tense of 'swim.' Therefore, 'swam' correctly completes the sentence: 'Theo was in great shape; he swam all the way back to the pier.' 'Swimmed' is not a valid past tense form of 'swim,' 'swum' is the past participle form and doesn't fit the context, and 'swim' is the base form of the verb and is not suitable in this case.

Correct Answer: C

Rationale: In the sentence 'The bird flew across the blue sky,' 'bird' is the noun. A noun is a word that represents a person, place, thing, or idea. In this sentence, 'bird' represents a living creature, making it the noun. 'Across' is a preposition used to show the relationship between 'flew' and 'sky.' 'Flew' is a verb indicating an action, and 'blue' is an adjective describing the sky.

Correct Answer: A

Rationale: The correct answer is 'him or her' because it agrees with the singular noun 'child.' When referring to a singular subject of unknown gender, 'him or her' is a suitable pronoun choice to maintain grammatical correctness. Options B, C, and D are incorrect as they do not match the singular form of 'child.' Using 'them' (B) would be plural, 'it' (C) is not appropriate for a person, and 'she or he' (D) is unnecessarily wordy and less commonly used in modern English.

Correct Answer: C

Rationale: The correct word is 'too,' which indicates an excessive amount. In this sentence, 'too high' describes the fever being excessively high, making it difficult for the child to lie comfortably. The other options do not fit the context: 'to' is a preposition, 'much' describes quantity but not excessiveness, and 'more' indicates a comparison, which is not relevant here.