Correct Answer: B

Rationale: The correct answer is B: 'Obvious or easily observed.' Overt means something that is not hidden or concealed but rather openly displayed or easily noticed. Choice A, 'Hidden,' is the opposite of overt. Choice C, 'Barely noticeable,' implies something not overt but rather subtle. Choice D, 'Misleading,' is unrelated to the definition of overt.

Correct Answer: B

Rationale: The correct answer is 'She has completed the project.' The sentence uses the present perfect tense with 'has completed,' which is the correct form of the verb. Choice A is incorrect due to the subject-verb agreement error ('She' requires 'has' instead of 'have'). Choice C is incorrect as it changes the meaning by using the passive voice 'has been completed' instead of the active voice. Choice D is incorrect as 'complete' should be 'completed' to match the present perfect tense.

Correct Answer: A

Rationale: The word 'labile' is used to describe something that is constantly changing or easily altered. Therefore, the best synonym for 'labile' is 'extremely changing.' Choice B, 'suicidal,' is incorrect as it does not relate to the meaning of 'labile.' Choice C, 'rapidly changing,' is close but not as precise as 'extremely changing.' Choice D, 'with a high fever,' is completely unrelated to the meaning of 'labile.'

Correct Answer: A

Rationale: The correct answer is A: 'Thick and sticky.' Viscous describes a substance that is thick and sticky, resisting flow easily. Choices B, C, and D are incorrect. 'Slimy' implies a slippery, gooey texture; 'Watery' describes a substance with a thin, fluid consistency; and 'Dry' indicates the absence of moisture.

Correct Answer: B

Rationale: Sallow skin refers to skin that has a yellowish tint. The term 'sallow' specifically describes a complexion that appears somewhat yellowish or unhealthy. Choice A, 'Has a reddish tint,' is incorrect as sallow skin is not reddish. Choice C, 'Has a bluish tint,' is incorrect as sallow skin is not bluish. Choice D, 'Has a greenish tint,' is incorrect as sallow skin is not greenish.