21. His bobby is ________ playing comuter games ________ taking photos. It's making model toys..

　 A. either, or　 B. both, and　 C. not only, but also　 D. neither, nr

20. Do you remember ________ me somewhere before.　 A. to meet　 B. met　 C. meeting　 D. meet

19. --Let's have a rest, shall we?　　 -- Not now. I don't want to stop ________ the letter yet.

　 A. write　 B. to write　 C. writing　　 D. and write

18. --When can I come for the photos? I need them tomorrow afternoon.

　 --They ________ ready by 12:00.

　　 A. writing　 B. to write　 C. written　　 D. Write

17. When autumn comes, some tree leaves ________ red.　　 A. sound　 B. turn　 C. smell　　 D. taste

16. I'll ________ this done by five o'clock..

　　 A. try having　 B. try to get　 C. try doing　　 D. try getting

14. I'm too busy ________ to my family often.　 　　A. writing　 B. to write　 C. written　　 D. write

15 It's everybody's duty to stop throwing rubbish ________ .

　 A. more and more　 B. here and there　 C. up and down　 D. sooner or later

13. If　 you　 ________ him tomorrow, please ask him if he _______ hiking with us.

A. see, goes　 B. will see , goes　 C. will see, will see　 D. see, wil go

12.--Who's the tallest boy in your class?　

　 --Mike is taller than any _______ boy students in our class.

A. each　 B. other　 C. another　　 D. one

11. --Have you finished your work yet?

　 --No,not yet.I think it'll take ______ ten minutes.

A. another　　 B. other　 C. others　 D. more