Correct Answer: A

Rationale: After robbing the bank, 'the thief fled' is the correct choice as it logically follows the action of robbing a bank. The singular pronoun 'he' in choice B is not appropriate as 'the thief' is singular. Choices C and D use 'they,' which is a plural pronoun and does not agree with 'the thief,' making them grammatically incorrect.

Correct Answer: A

Rationale: The correct answer is A: 'The homework was completed by the student.' This sentence is in the passive voice because the subject (homework) is being acted upon by the student. In passive voice constructions, the subject receives the action rather than performing it. Choices B, C, and D are in active voice where the subject performs the action. In choice B, 'The student completed the homework,' the subject (student) is the one performing the action of completing the homework.

Correct Answer: A

Rationale: The correct answer is 'living well.' The sentence lists actions using '-ing' forms (making, traveling, and living), so 'living well' maintains parallel structure. Choice B ('to live well') breaks this structure by introducing an infinitive form. Choice C ('to be happy') introduces a new action not in parallel with the others. Choice D ('enjoying life') changes the structure and focuses on a different action not consistent with the previous activities listed.

Correct Answer: A

Rationale: The correct preposition to use after 'within 24 hours' in this context is 'of.' Therefore, the tuberculin skin test should be read within 24 hours of administration. The other choices ('before,' 'after,' 'during') do not correctly convey the relationship between the timing of reading the test and the administration.

Correct Answer: B

Rationale: The correct answer is B: 'Vague.' Nebulous means something that is vague or unclear. Choices A, C, and D are incorrect because nebulous is the opposite of clear, distinct, and complex. Nebulous refers to something lacking definite form or limits, making it difficult to understand or perceive clearly.