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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