单项选择题

The doctor tried to do an experiment to find out the （） of the medicine on the mice.

A. cause
B. result
C. reason
D. effect

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单项选择题

The wind was so strong last night that is tore the （） of the ship into two or three pieces.

A. mask
B. mine
C. sail
D. satellite

单项选择题

John left home twenty minutes ago. It is usually half an hour’s drive from his home to the office here. So he （） soon.

A. should have arrived
B. need arrive
C. must have arrived
D. may arrive

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