单项选择题

Anyone who enters the factory floor should wear a helmet and safety vest at ______ times.

(A) any
(B) all
(C) every
(D) each
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单项选择题
Because the project involves so many different individuals and organizations, the ______ of it will be particularly challenging.
(A) coordinate
(B) coordinator
(C) coordinated
(D) coordination
单项选择题
The organizers expect between 40,000 ______ 50,000 people to attend the day-long music festival.
(A) or
(B) and
(C) both
(D) either
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