Correct Answer: A

Rationale: In this sentence, 'who' is the correct pronoun to refer to 'Children,' indicating that children are the ones who obey their parents. Using 'who' makes the sentence grammatically correct by connecting the subject 'children' with the verb 'obey.' The pronoun 'which' is used for things, not people, so it is incorrect. 'Should' and 'to' do not fit in the context of the sentence and do not provide the necessary connection between 'children' and 'obey.' Therefore, the correct choice is 'who.'

Correct Answer: D

Rationale: 'Have to' is the correct choice as it fits the sentence structure. The sentence is in the past tense ('did we') and requires the infinitive form 'have to' to express the idea of necessity or obligation in the past. 'Has to' (Choice A) is incorrect as it is present tense, 'haven't' (Choice B) is a negative form and does not make sense in this context, and 'had to' (Choice C) would imply a past obligation that has already been fulfilled, which is not the intended meaning here.

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: A

Rationale: In the sentence, 'She asked ____ to take her around the corner to the drugstore,' the correct word to fill in the blank is 'him.' The pronoun 'him' is in the objective case and is used correctly as the object of the verb 'asked.' The other options ('his,' 'he,' and 'his'') are either possessive or nominative cases, which do not fit the grammatical structure needed here. 'His' is possessive, 'he' is nominative, and 'his'' is incorrect due to the unnecessary apostrophe.

Correct Answer: A

Rationale: In this sentence, 'lie' is the correct word for the patient wanting to recline on the bed, and 'lay' is the correct word for placing the tray of food on the table. Therefore, 'lie, lay' is the proper sequence of words for the actions described in the sentence. Choice B is incorrect because 'lie' should be used for reclining, not 'lay'. Choice C is incorrect as 'laid' is the past tense of 'lay,' not the present tense. Choice D is incorrect; 'lain' is the past participle of 'lie,' not the present tense.