单项选择题

If airport authorities consider it ______ to shut down the entire terminal for security reasons, they should be allowed to do so.

(A) necessity
(B) necessitate
(C) necessary
(D) necessarily
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Because employees were forced to arrive at work ______ than usual this morning, they will be allowed to leave at 4:00 pm.
(A) early
(B) earliness
(C) earliest
(D) earlier
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In order to take advantage of the sales tax rebate, travelers are ______ to present all receipts for purchases made in the country.
(A) confirmed
(B) determined
(C) acquired
(D) supposed
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