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
Burglars()and stole some money while the family was away.

A. broke up
B. came to
C. broke in
D. built up
单项选择题
() most of the earth's surface is covered by water, fresh water is very rare and precious.

A. As
B. Once
C. If
D. Although
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