22.The windows of our house _____once a week.
A. must clean B. have cleaned C. is cleaned D. are cleaned
21. This English song _____ often _____ by the children.
A. is, singing B. is, sung C. will, sing D. was, sung
20. Man-made satellites ______into space by many countries.
A. was sent up B. is sent up
C. have been sent up D. has been sent up
A. filled B. fill C. full D. fulled
18. They ______day and night.
A. are made work B. are made to work
C. made to be worked D. are making to work
17. We can't enter the room because its door______ .
A. locked B. locks C. is locked D. is locking
16. When water______ , it will be changed into vapor(蒸汽).
A. is heated B. heating C. has heated D. heats
15. The war______ in 1941.
A. broke out B. had been broken out
C. was broken out D. had broken out
14. I ______the way to the railway station by a policeman.
A. was shown B. showed C. have shown D. was showing
13. We can't use the bridge now, because it______ .
A. has been repaired B. is repairing C. is repaired D. is being repaired
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