1.There are many kinds of metals, ________.

A.each having its special properties.

B.Having its special properties.

C.One has its special properties.

D.Each has its special properties.

2.He remembered _______ to the zoo by his father when he was little.

A.being taken B. taking

C. have been taken D. to have taken

3.The team really looks good tonight because the coach had them ______ every night this week.

A.practice B. to practice

C. practiced D. practicing

4.______ in the air, fuels give off heat.

A.To burn B. Burned

C. To be burned D. Being burned

5. ______ from space, our earth, with water covering 70% of its surface, appears as a “blue planet.”

A. Seen B. Seeing

C. To be seen D. Having seen

答案：1-5 AAACA

6.Nobody can be set in motion without a force _____ on it.

A.act B. to act

C. acting D. acted

7.He has already made up his mind. It’s no use ______ him.

A.try to persuade B. trying to persuade

C. to try to persuade D. to try persuading

8.It is much easier to talk about social change than ______.

A.to bring it about B. to bring it on

C. to bring it up D. to bring it out

9.There may be, somewhere outside the solar system, intelligent life ______ messages to us.

A.sends B. sent

C. sending D. has sent

10.Beijing is now busy ______ the Olympic games which is to be held in the year 2000.

A.preparing for B. prepared for

C. to prepare for D. prepare for

答案：6-10 CBACA

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