Correct Answer: B

Rationale: The term 'adverse' is used to describe something that is unfavorable, unwanted, or potentially harmful. This makes choice B, 'Undesired, possibly harmful,' the correct definition. Choices A, C, and D are incorrect because they describe positive (desirable, beneficial) or neutral characteristics, which are the opposite of what 'adverse' means.

Correct Answer: B

Rationale: The correct definition of dilute is to make a liquid less concentrated. When a substance is diluted, it means it has been mixed with another substance to reduce its strength or concentration. Option A, 'To concentrate,' is the opposite of dilute. Option C, 'To solidify,' means to make or become hard or solid, which is unrelated to diluting a liquid. Option D, 'To evaporate,' means to change from a liquid to a vapor, also unrelated to diluting a liquid. Therefore, the correct answer is B.

Correct Answer: B

Rationale: The term 'Occluded' means something is closed or obstructed, not open as in choice A. It is more than just partially obstructed as in choice C. It does not mean expanded as in choice D. Therefore, the correct answer is B, 'Closed or obstructed.'

Correct Answer: B

Rationale: The term 'adverse' is used to describe something that is unfavorable, unwanted, or potentially harmful. This makes choice B, 'Undesired, possibly harmful,' the correct definition. Choices A, C, and D are incorrect because they describe positive (desirable, beneficial) or neutral characteristics, which are the opposite of what 'adverse' means.

Correct Answer: B

Rationale: The correct definition of 'depress' is to press downward. This term is commonly used to describe pushing something downward or making something lower in position or level. Choice A, 'To push forward,' is incorrect as 'depress' does not involve moving something forward. Choice C, 'To remove,' is incorrect as 'depress' does not entail taking something away. Choice D, 'To elevate,' is incorrect as it is the opposite of what 'depress' means.