11. -- Where is the holiday village?
-- It is about three miles _______ the south of the river.
A. on
B. in
C. at
D. to
12. My uncle ______ until he was forty-five.
A. married
B. didn't marry
C. was not marring
D. would marry
13. -- What are you going to ask him?
-- How much time _______ left before the opera begins?
A. there is
B. is there
C. it is
D. is it
14. In general, simpler plants appeared on the earth before those _______.
A. are complicated in structure
B. complicated in structure
C. have a complicated structure
D. their structure is complicated
15. The trend towards smaller families has turned out to be more widespread than ______.
A. we had previously thought
B. previously thought
C. we previously think
D. is previously thought
16. Rather than ____ their bicycles and ____ in the fields, people now sit on assembly lines and spend their free time watching television.
A. they ride; work
B. to ride; to work
C. riding; working
D. they rode; worked
17. Workers are receiving strict training to make sure that the techniques _____ safely and effectively.
A. are done
B. have been done
C. will be done
D. be done
18. The space shuttle is circling the earth, traveling _______ of sound.
A. at 20 times file speed
B. at the speed 20 times
C. at 20 times of the speed
D. at the speed of 20 times
19. The space-station astronauts have enough food and water supplies _____ until June.
A. to beheld out
B. to hold out
C. holding out
D. being held out
20. Scientifically speaking, the nerve-centre is _______ sound waves are turned into electrical signals and sent to the brain.
A. how
B. when
C. why
D. where
参考答案：
C B C D A C D D A B
D B B B B C A A B D
