Correct Answer: B

Rationale: The correct answer is B: 'Swift.' PRECIPITOUS means something that is steep or sheer, often used to describe a very rapid or sudden change. This word does not relate to something gradual (choice A), slow (choice C), or delayed (choice D). Therefore, 'Swift' is the best definition for PRECIPITOUS.

Correct Answer: C

Rationale: A flexible tube would be appropriate for navigating through a curved pipe as it can bend and maneuver easily within the pipe's shape. This flexibility allows the plumber to access and address any blockages or issues efficiently. Solid and rigid tubes would be challenging to use in a curved pipe due to their lack of flexibility, making navigation difficult. Perforated tubes, with holes, are not typically used for this purpose and are more suited for specific applications like drainage systems.

Correct Answer: A

Rationale: The correct answer is A: 'She had one goal: to win the race.' This sentence uses a colon to introduce the purpose or explanation that follows. It is a grammatically correct use of a colon. Choice B is incorrect as the colon is not needed after 'needs'; a list of items follows, which does not require a colon. Choice C is a simple statement of time and does not require a colon. Choice D is also incorrect since a colon is not suitable after 'bought'; the items bought are listed without the need for a colon.

Correct Answer: B

Rationale: The correct answer is B: 'Exhausted.' Lethargic describes a state of feeling sluggish, tired, and lacking energy, which aligns with being exhausted. Choice A, 'Energetic,' is the opposite of lethargic and does not fit the description. Choice C, 'Confused,' refers to a state of disorientation rather than physical tiredness. Choice D, 'Restless,' implies a state of agitation or inability to relax, which contrasts with the typical presentation of someone who is lethargic.

Correct Answer: B

Rationale: The correct answer is B, 'Vague.' Nebulous means something that is vague or unclear. Choice A, 'Clear,' is incorrect as it represents the opposite meaning of nebulous. Choice C, 'Precise,' is incorrect as it denotes clarity and exactness, which is the opposite of nebulous. Choice D, 'Obvious,' is also incorrect as it implies something that is easily understood or seen, unlike nebulous which refers to something unclear or hazy.