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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

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

11.The scientist didn’t mind ______ and went on with his investigation.

A.laughing at

B. to be laughed at

C. being laughed at

D. laughed at

12.Mr. Baker sent his son to the doctor _____ an X-ray check.

A.gives

B. to give

C. being given

D. to be given

13.Mother warned _______ the electric lamp.

A.not to touch

B. him not to touch

C. him not touching

D. him not to touch

14._______ is one of good properties of this metal.

A.light in weight

B. Having been light in weight

C. Be light in weight

D. Being light in weight

15.He gave no opinion about the matter because he didn’t want to risk _______ in it.

A.to involve

B. being involved

C. to be involved

D. involving

16.With tears on her face, the old lady watched the little boy _______ to a hospital.

A.send

B. to be sent

C. being sent

D. sending

17.______ the book again, she discovered that she had missed a lot in her first reading.

A.While reading

B. When read

C. As reading

D. In reading

18.Your experiment reports must be checked with care before ________.

A.handed them in

B. them handing in

C. being handed in

D. handing them in

19.Mr. and Mrs. Smith didn’t expect the house ______ so well.

A.to be decorated

B. to decorate

C. be decorated

D. decorating

20.She was sitting in an armchair ______ a book.

A.reading

B. to read

C. to be reading

D. to have read

答案： 1-5 AAACA  6-10 CBACA  11-15 CBBDB     16-20 CACAA

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