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: C

Rationale: The correct answer is 'C: herself.' In this sentence, 'herself' is the reflexive pronoun that correctly refers back to Mary Ann. It shows that Mary Ann is giving credit to herself for studying hard and passing the test. The use of 'oneself' (choice A) would be incorrect here as it is too general and does not specify Mary Ann. Choices B and D ('itself' and 'themselves') are also incorrect because they do not match the singular subject 'Mary Ann.' Therefore, 'herself' is the only option that fits both grammatically and contextually in this sentence.

Correct Answer: D

Rationale: The correct form in this sentence is 'inputting,' as it is the gerund form of the verb 'input.' The gerund form is used to show that Kalinda spends part of her day engaging in the ongoing action of inputting data from the lab. Choice A ('inputs') is incorrect as it is the third-person singular form of the verb, which does not fit here. Choice B ('input') is incorrect as it is the base form of the verb and does not convey the ongoing action required in this context. Choice C ('having input') is incorrect as it suggests a completed action rather than an ongoing one.

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: C

Rationale: The correct answer is C. The sentence requires an infinitive form of the verb 'to conduct' after the verb 'promised.' This structure is commonly used in English grammar, where the main verb 'promised' is followed by an infinitive verb form. Therefore, the sentence should read: 'The students promised to conduct themselves with quiet dignity.' Choice A ('conduct') is incorrect as it is not in the infinitive form required after 'promised.' Choice B ('conducting') is incorrect as a gerund does not fit the grammatical structure of the sentence. Choice D ('to be conducted') is incorrect as it changes the meaning of the sentence, suggesting that someone else will conduct the students, rather than the students conducting themselves.