22. This is a big class, and ______ of the students are girls.

A. two third　　 B. second three　　 C. two thirds　 D. two three

21. --- We had better ask Bob to help us. --- ______ he is away on business.

A. so　　 B. And　 C. Or　　 D. But

20. --- Who in Tom’s family will come to your birthday party?　 --- Either Tom _____ any of his sisters is coming.

A. and　 B. but　 C. or　 D. nor

19. There are about two ______ students in the newly built school.

A. thousand　 B. thousands　 C. thousand of　 D. thousands of

18. --- There are sixty students in our class. And ____ of us are boys. --- Wow! You have forty girls.

A. one fourth　 B. one third　 C. two fifths　 D. two thirds

17. On the first day of October 2009, our great country will have its ______ birthday.

A. sixty　 B. sixties　 C. sixtieth　　 D. the sixtieth

16. --- Hurry up. The bus is coming.　 --- Oh, no. We mustn’t cross the street ______ the traffic light is green.

A. after　 B. since　 C. while　 D. until

15. Mille was watching TV _____ Andy opened the door.

A. until　 B. when　 C. before　 D. after

14. ____ many children like KFC, I think they’d better try not to eat it too often.

A. Because　 B. If　　 C. So　　 D. Although

13. I enjoy learning English, _____ it takes me a lot of time.

A. as if　 B. though　　 C. because　 D. for