20. 　 Grace advised us to withdraw ______.

A. so as to get not involved　　　 B. so as not to get involved

C. so that to get not involved　　 D. as not to get involved

19. 　 You should remember ______ from the point when you are writing a composition.

A. don’t wander　　　 B. not to wander　　 C. no wandering　　　 D. not wander

18. 　 I don’t allow ______ in my office and I don’t allow my family ______ at all.

A. to smoke…smoking　　 B. smoking…to smoke

C. to smoke…to smoke　　 D. smoking…smoking

17. 　 Since she is angry, we ______.

A. had better leaving her alone　　　 B. should leave her alone

C. might as well leave her alone　　 D. had rather leave her alone

16. 　 I _______ the truth of your remarks, although they go against my interests.

A. cannot but admit　　　 B. cannot help but to admit

C. cannot but admitting　　 D. cannot help but admitting

15. 　 “Do you want to give a talk on that subject?”

“I prefer ______ .”

A. not want　　　 B. not wanting　　　 C. to not giving　　　 D. not to

14. 　 I have tried _______ worrying about it.

A. to stop consciously　　　　 B. to consciously stop

C. to conscious stopping　　　 D. to stopping consciously

13. 　 I’m not going to ask the teacher why he gave me that grade; I intend _______.

A. to let rest the matter　　　 B. the matter to be let resting

C. letting the matter to rest　　 D. to let the matter rest

12. 　 Induction means ______ a general conclusion from special facts.

A. to come to　　 B. to coming　　 C. coming to　　 D. came

11. 　 We must have an engineer ______ the workers build the house.

A. to see　　 B. see　　 C. seeing　　 D. seen