11. ______ in thought, he almost ran into the car in front of him. (NMET96)

　　A. Losing B. Having lost C. Lost D. To lose

　　12.The research is so designed that once ____ nothing can be done to change it. (NMET2002)

　　A. begins B. having begun C. beginning D. begun

　　13. ---What do you think made the woman so upset？

　　--- _____ weight.(1997上海试题)

　　A. As she put on B. Put on C. Putting on D. Because of putting on

　　14. Time should be made good use of ____ our lessons well.

　　A. learning B. learned C. to learn D. having learned

　　15. Can _____ be in the desk _____ you have put my letter？

　　A. it；which B.I；Where C. you；in which D. it；that

　　16. Never _____ time come back again.

　　A. has lost B. will lose C. will lost D. lose

　　17.--- ____ was it ____ they discovered the entrance to the underground palace?

　　--- Totally by chance.

　　A. What, that B. How, that C. When, how D. Where, that

　　18. I have nothing to confess. ____ you want me to say?

　　A. What is it that B. What it is what C. How is it that D. How it is that

　　19. Is this factory _____ you visited the other day？

　　A. the one B. that C. where D. when

　　20. Was it _____ she heard with her ears _____ really made her frightened？

　　A. what；that B. it；that C. that；which D. what；／

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