题目内容

Turn _______the lights when you leave the room.

A. on
B. off
C. up
D. down

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______________ beautiful pen holder!

A. What a
B. What
C. How
D. How a

Air pollution is a ___________ problem all over the world.

A. grows
B. growing
C. grew
D. grown

We should try ____________ white pollution.

A. to reduce
B. reducing
C. reduces
D. reduced

在子查询中，（）关键字表示满足其中任意一个条件。

A. IN
B. ALL
C. ANY
D. EXISTS