22. The flu is believed _______ by viruses that like to reproduce in the cells inside the human nose and throat. (2004上海)

A. causing　　　　　 B. being caused　 C. to be caused　 D. be have caused

21. According to a recent U.S. survey, children spent up to 25 hours a week _________ TV. (2004上海)

A. to watch　　　　 B. to watching　　 C. watching　　　 D. watch

20. __________ by the beauty of nature , the girl from London decided to spend another two days on the farm . (2004辽宁)

A．Attracting　　 B．Attracted　　　 C．To be attracted　　 D．Having attracted

19. I don’t know whether you happen________ , but I’m going to study in the U.S.A. this September. (2004辽宁)

A．to be heard　　 B．to be hearing　 C．to hear　　　　 D．to have heard

18. ________ straight on and you’ll see a church . You won’t miss it. (2004湖北)

A．Go　　　　 B．Going　　　　　 C．If you go　　　　　 D．When going

17. ____________ with the size of the whole earth, the biggest ocean does not seem big at all. (2004湖北)

A．Compare　　　　　　　　　　　　　 B．When comparing

C．Comparing　　　　　　　　　　　　 D．When compared

16. You were silly not ____ your car. (2004湖南)

A. to lock　　　　 B. to have locked C. locking　　　 　D. having locked

15. Reading is an experience quite different from watching TV; there are pictures _____ in your mind instead of before your eyes. (2004广西)

A. to form　　　　 B. form　　　　　 C. forming　　　　 D. having formed

14. Helen had to shout _____ above the sound of the music. (2004广西)

A. making herself hear　　　　　　　 B. to make herself hear

C. making herself heard　　　　　　 D. to make herself heard

13. ______ the programme, they have to stay there for another two weeks. (2004广东)

A. Not completing　　　　　　　　 B. Not completed　

C. Not having completed　　　　　 D. Having not completed