1. We have two rooms ______ , but I can’ t decide ________ .
A. to live;to choose which one B. lived;choose which
C. to live in;which one to choose D. live;which one
2. —Are you going to the party ____________ at Smith's home this evening?
—I will if I am free.
A. holding B. held C. to hold D. to be held
3.. Our teacher did what she could ____________ us with English.
A. help B. helped C. helping D. to help
4. 物need doing = 物 need to be done
5. have trouble / problem / difficulty (in) doing
6. 疑问词+ to do 相当于名词 在句子中作主语,表语,和宾语
7. by the end of +过去时间 用在过去完成时中
+将来时间 用在将来完成时 will have done
8. help sb with sth 在某方面帮助某人
9. regard ....as / treat ...as 把……当作……
10. see sb do 变成被动语态时,把省去的to 补回来
11. in the past few years 在过去的几年里 现在完成时的标志
12. be replaced by 被……代替
13. allow doing
14. be made of 由......组成 (看出原料)
15. be made from (看不出原料)
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