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.

Correct Answer: A

Rationale: The correct answer is 'dog, who had.' The phrase 'dog, who had' correctly indicates that Janet called her dog to run after a squirrel. In this case, 'who had' provides additional information about the dog, making the sentence grammatically accurate. Choices B, C, and D are incorrect because they do not use the appropriate relative pronoun 'who' for referring to animals.

Correct Answer: B

Rationale: 'Presents' is the correct choice here. The sentence requires a verb that indicates the condition appearing with a symptom. In medical terminology, when a condition 'presents' with a symptom, it means that the symptom is a noticeable feature or indication of the condition. Therefore, 'presents' is the appropriate verb to describe how the condition manifests itself with vertigo. The other options do not fit the grammatical structure of the sentence.

Correct Answer: D

Rationale: The sentence is in the past tense, indicating that the action occurred before the present moment. 'Began' is the correct past tense form of the verb 'begin' in this context. It shows that Stan started reviewing his class notes in the past. Choice A ('begins') is incorrect as it represents present tense. Choice B ('begun') is incorrect as it is the past participle form and does not fit the sentence structure. Choice C ('begin') is incorrect as it is the base form of the verb and not appropriate for the past tense context of the sentence.

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.