19. ________ to ask me for help?

A. Why don’t come　 B. Why not come　 C. Why not to come　　　 D. Why to not come

18. When you _________, they have gone to school.

A. got　　　　　　　　　　 B. reached　　　　　　 C. arrived　　　　　　　　 D. arrived at

17. We should plant more trees because they can ________ harmful gases.

A. put in　　　　　　　 B. put on　　　　 C. take on　　　　　 D. take in

16. I have to do ________ homework today. I am very busy.

A. too much　　　 B. too many　　　 C. much too　　　　 D. little

15. We should read books ________.

A as much as possible　　　　 B. as many as possible　　

C. as many as you can　　　　 D. as much as you can

14. I went to school without ________ anything.

A. to eat　　　　　　　　 B. eating　　　　　 C. eat　　　　　　　　　　　 D. to eating

13. The teacher asked us _________ in class.

A. not talk　　　　　　　 B. to not talk　　　 C. not to talk　　　　　　 D. don’t talk

12. The heavy rain ________ us ________ to school.

　 A. keeps; going　　 B. stops; going　　 C. to keep; to go　　　 D. stops; to go

11. Your school uniform is different ________ ours, but don’t throw them _________.

　 A. away; from　　　 B. from; away　　 C. as; from　　　　 D. to; as

10. ________ your help, I can’t work out the problem.

　 A. With　　　　　 B. No　 C. Without　　 D. Under