单项选择题

We hadn't expected a power cut so we were astonished when the whole house was ______ into darkness.

A. dived
B. plunged
C. drowned
D. dropped
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单项选择题
I am quite sure that I can ______ Michael into letting us use his car tomorrow.
A. speak
B. talk
C. tell
D. say
单项选择题
To survive in the intense market competition, we must ______ the qualities and varieties of products we make to the world-market demand.
A. improve
B. guarantee
C. gear
D. enhance
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