单项选择题

The most important thing to do ______ the pollution as soon as possible.

A. are got rid of
B. is to get rid of
C. is get rid of
D. is for us getting rid of

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单项选择题

So heavy ______ that we were prevented from going out.

A. the rain was
B. is the rain
C. was the rain
D. would the rain be

单项选择题

During July and August there was no rain for weeks______.

A. by the end
B. in the end
C. at the end
D. on end

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