13、When asked why he went there, he said he was sent there    for a space flight.

A.training       B.being trained    C.to have trained  D.to be trained

12、A survey of the opinions of experts    that three hours of outdoor exercise a week   good for one’s health.

A. show; are     B. shows; is     C. show; is    D. shows; are

11、Many people have come to realize that they should go on    balanced diet and make   room in their day for exercise.

A. a;/        B. the; a     C. the; the     D./;a

10、—Where is my dictionary? I remember I put it here yesterday. 

—You    it in the wrong place.

A. must put      B. should have put     C. might put   D. might have put

9、—What do you think of the performance today?

—Great!     But a musical genius could perform so successfully.

A. All      B. None      C. Anybody       D. Everybody

8、He was told that it would be at least three more months   he could recover and return to work.

A.when        B.before       C.since    D.that 

7、The melon the Smiths served at dinner would have tasted   if it had been put in the fridge for a little while.

A.good        B.better       C.best     D.well

6、—I have got a headache.

—No wonder. You    in front of that computer too long.

A.work       B.are working    C.have been working  D.worked

5、After graduation she reached a point in her career     she heeded to decide what to do.

A.that       B.what        C.which      D.where 

4、Experts have been warning    of the health risks caused by passive smoking

A.at a time     B.at one time    C.for some time   D.for the time