Correct Answer: C

Rationale: The correct option to substitute for 'Roseanne's' is 'her' to maintain correct pronoun-antecedent agreement. In this case, using 'her' makes the sentence grammatically correct and clear by referring back to Roseanne in a proper manner. Choice A, 'she,' is a subject pronoun and does not match the possessive form needed in the sentence. Choice B, 'their,' is plural and does not agree with the singular possessive 'Roseanne's.' Choice D, 'hers,' is a possessive pronoun but cannot directly replace 'Roseanne's' in this context; 'her' is the appropriate choice to indicate possession.

Correct Answer: C

Rationale: The word 'study' is used incorrectly in the sentence. The correct verb form should be 'studies' to match the subject 'Sidney,' which is singular. The sentence should read, 'Jack practices piano while Sidney studies for the exam.' The other choices ('practices,' 'while,' and 'exam') are used appropriately in the sentence.

Correct Answer: B

Rationale: The correct word to make the sentence grammatically correct is 'too.' In this context, 'too' means excessively or to a higher degree, indicating that the person is extremely uncomfortable and needs another pillow. 'To' is a preposition and does not fit the context of the sentence. 'Much' is an adverb used to refer to a large quantity, not the degree of discomfort. 'Lesser' is a comparative adjective, which is not suitable for expressing the level of discomfort in this sentence. Therefore, 'too' is the most appropriate choice to convey the intended meaning.

Correct Answer: A

Rationale: The phrase 'as long as' is used to indicate a condition that needs to be met for the main clause to happen. In this sentence, the radiology department sends Troy to pick up lunch only if it isn't too busy at the office, so 'as long as' is the most suitable phrase to convey this conditional relationship. Choice B, 'as if,' implies a hypothetical comparison rather than a condition. Choice C, 'after,' suggests a sequence of events rather than a condition. Choice D, 'unless,' introduces a negative condition which does not fit the context of the sentence.

Correct Answer: A

Rationale: The word 'iterate' is not spelled correctly in the sentence. The correct word that should be used here is 'itinerant,' which means constantly traveling from place to place, especially for work. In this context, 'iterate' does not fit as it means to repeat a process or utterance. 'Continually' is spelled correctly and means happening without interruption. 'Within' and 'district' are also spelled correctly and are used appropriately in the sentence. Therefore, choice A is the correct answer.