Correct Answer: A

Rationale: The correct answer is A: 'This door will remain unlocked when the office is occupied.' This choice provides a clear and grammatically correct revision of the original sentence.
Choice B is incorrect due to the missing 'will' before 'remain' and 'the' before 'office.'
Choice C is incorrect as it does not include 'the office,' making it less specific.
Choice D is incorrect as it uses 'while' instead of 'when,' changing the intended meaning.

Correct Answer: B

Rationale: The correct definition of bilateral is something that is present on two sides. This term is commonly used in medical contexts to describe conditions or procedures that affect or involve both sides of a particular part of the body.
Choice A, 'Occurring on one side,' is incorrect because bilateral refers to both sides, not just one.
Choice C, 'Occurring in random areas,' is incorrect as bilateral specifically means on two sides, not random areas.
Choice D, 'Not occurring,' is also incorrect as bilateral refers to something present on two sides, not the absence of occurrence.

Correct Answer: B

Rationale: The correct answer is B: 'Measures contributing to cleanliness and good health.' Hygiene encompasses practices that promote cleanliness and overall good health, such as washing hands, maintaining personal hygiene, and keeping the surroundings clean.
Choice A has been revised to 'General cleanliness and good health practices' to better reflect the concept of hygiene. Hygiene goes beyond just cleanliness to include specific measures for maintaining health.
Choice C is incorrect as hygiene is not specifically related to dietary health; it is more about cleanliness and health practices.
Choice D is incorrect as hygiene is not a type of infection; it is about preventing infections through proper practices.

Correct Answer: A

Rationale: The correct answer is A: 'He is a legal resident of the United States.' In this sentence, 'legal' is used to describe the type of resident he is, making it an adjective. The other choices use 'legal' as part of a noun phrase or an adverbial phrase, not as an adjective.
Choice B uses 'legal' to describe the type of action, making it a noun adjunct.
Choice C uses 'legal' to describe the legality of the action, making it part of an adjectival phrase.
Choice D uses 'legal' to describe the manner in which he acted, making it an adverb.

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.