21. _______ of us should finish the work on time.

A. Each　 B. Everyone　 C. Every　　 D. Eachone

20. I’m sorry I forgot ________ (give) the book back to you.

19. The interesting story made all of us ________ (not keep)quiet in class.

18. Where is my pen?　 My mother _______ (take) it away.

17. One of the boys ________ (be) born in 1992.

16. How long _______ you ________ (study) English?

15. Thank you for ________ (give) me the presents.

14. If you ________ (not know) the answer, you’d better _______ (put) up hands.

13. The old man _________ (be) ill for three years.

12. The girl _______(use) to do some reading when she was a child.