Correct Answer: D

Rationale: The word 'their' is used incorrectly in the sentence. The correct word should be 'they're,' which is a contraction for 'they are.' The sentence should say: The boys leapt up, happy to assist their favorite teacher. Choice A, 'leapt,' is correctly used as the past tense of 'leap.' Choice B, 'happy,' is also correctly used as an adjective to describe the boys' emotional state. Choice C, 'assist,' is appropriately used as a verb to show the boys' willingness to help.

Correct Answer: A

Rationale: In this context, 'principle' is spelled incorrectly. The correct word should be 'principal,' which means main or primary. 'Principle' refers to a fundamental truth or belief. Choice B, 'role,' is correctly spelled. Choice C, 'provision,' is also spelled correctly. Choice D, 'convenient,' is spelled correctly as well. Therefore, the correct answer is A as it is the only word spelled incorrectly in the context of the sentence.

Correct Answer: D

Rationale: The phrase 'the nurses' laughter' indicates possession by the nurses, a plural subject. Therefore, the appropriate possessive pronoun to use in this context is 'their,' which correctly reflects possession by multiple nurses. Choice A ('his') is singular and refers to a male subject, not suitable for a group of nurses. Choice B ('hers') is singular and refers to a female subject, not suitable for a group of nurses. Choice C ('them') is a pronoun used for a group of people, but it doesn't indicate possession as required in the sentence.

Correct Answer: B

Rationale: The correct answer is B, 'lead.' The correct spelling should be 'led' in the context of the sentence. 'Lead' is a present tense verb, while 'led' is the past tense of 'lead' when used in the sense of guiding or showing the way. Choice A, 'attending,' is spelled correctly. Choice C, 'entourage,' is spelled correctly. Choice D, 'interns,' is spelled correctly. The error lies in the verb 'lead' being used incorrectly in the past tense form.

Correct Answer: A

Rationale: The word 'her' is the best substitute for the underlined words 'the nurse' in the sentence. This substitution avoids redundancy and provides clarity by referring back to the nurse as a third-person singular pronoun, maintaining coherence and avoiding ambiguity. 'He' (choice B) and 'his' (choice C) are incorrect as they do not align with the gender of the nurse in the sentence. 'It' (choice D) is also incorrect as it does not refer appropriately to a person.