单项选择题

The most effective means for shop owners to learn how to make theirs more attractive is through ______ from their regular customers.

(A) alert
(B) objection
(C) feedback
(D) observation
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单项选择题
The company announced ______ it has decided to acquire materials from the region.
(A) what
(B) although
(C) that
(D) on account of
单项选择题
it is ______ that all drivers install air bags at the front row for the minimum safety.
(A) decisive
(B) active
(C) imperative
(D) regular
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