我们都知道语法词汇的重要性，这就需要同学们平时多加训练，环球博海小编特整理了2013年英语四级语法词汇强化习题(4) ，希望能够帮助到大家!

　　21. The vacuum cleaner is a valuable labor-saving ______ action.

　　A. device B. engine C. piece D. instrument

　　22. The flight was postponed because of technical problems and was finally cancelled last week when a ______ was discovered.

　　A. accident B. defect C. damage D. defeat

　　23. When she was crossing the road, she was knocked down by a motor-car and lay ______ by the roadside.

　　A. asleep B. thoughtless C. unconscious D. unaware

　　24. The novels he has written have shown his ______ ability as an author.

　　A. literal B. literally C. literature D. literary

　　25. The reader is urged to be a leader, rather than a follower; to rely on his own power, rather than to ______.

　　A. inform B. conform C. deform D. reform

　　26. He would much ______ it if you could do him the favor.

　　A. award B. apply C. appreciate D. anticipate

　　27. If our ______ is correct, then the space-craft should reach the moon on Monday.

　　A. calculation B. composition C. communication D. vision

　　28. San Francisco’s Chinese community, comprising 67, 000 ______ is the largest concentration of Chinese outside of Asia.

　　A. visitors B. workers C. adults D. inhabitants

　　29. We didn’t catch the train on ______ of the traffic congestion.

　　A. basis B. charge C. account D. behalf

　　30. Though he has suffered from cancer for so many years, it is so strange that he has ______ to the present day.

　　A. deprived B. survived C. derived D. revived