超星 - 7.2章节测验1 - 查题吧

单选题

When _________ files, I use both sides of the paper.

A. to print
B. prints
C. printing
D. printed

单选题

Turn _______the lights when you leave the room.

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

单选题

______________ beautiful pen holder!

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

单选题

Air pollution is a ___________ problem all over the world.

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

单选题

We should try ____________ white pollution.

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

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