o carry it out.
A. happened B. struck C. appeared D. occurred

11.Do you think that mixed ability classes _____ the better students?
A. hold back B. hold up C. hold down D. hold off

12._____ in the queue for half an hour, Tom suddenly realized that he had left his wallet at home.
A. To wait B. Have waited C. Having waited D. To have waited

13.Hearing the gunshot, all the birds flew ____ every direction.
A. in B. on C. to D. toward

14.Don’t _____ the notice. It should be kept for a week.
A. tear down B. put down　 C. turn down D. knock down

15.Finishing the task is very difficult but I can ____ it.
A. try B. do C. fail D. manage

三、短文改错：
It had rained for several days. I felt bored. Fortunately, it became
very fine on last Sunday morning. So I got up early and decided 1._________
to go for a walk and took some photos in the beautiful country.　2.__________
After breakfast, I carried camera with me and set off.3.__________
Everything did smoothly, I enjoyed my trip so much that I didn’t4.__________
realize the weather had turned badly again. I began to run5._________
and it was too lately. I was caught in the rain and was　 6.________
wet thoroughly. I went on ran until I got　7.________
the bus stop. I stood there waiting a long time for the　 8._________
bus, shivering with cold. Shortly after I got home,9._________
I had a high fever, that made me stay in bed for a whole week！ 　10.________

答案与分析：
一、
1.condition 2.protection 　 3.roots 4.discoveries  5.humorous
6.silence 　7.braked 　 8.appreciate 　 9.avoid 　 10.parted
11.anger 　 12.occurred 13.collection 　14.designer 　 15.attractions

二、
1.B pay attention to中的to 是介词，所以用stopping，表示“阻止地球被污染”，用being polluted。
2.B appreciate doing sth. 欣赏/喜欢做某事。
3.B It/ That all depends 那要看情况而定。
4.B date back to/date from 无被动语态，表示“追溯到---”。
5.C 去掉答语中的插入语do you suppose,句子结构一目了然，what has happened to him?

6.D the moment引起时间状语从句，用一般现在时替代一般将来时。
7.D over在这里表示“一边---一边”。
8.C not until用于强调句中，强调句中的定语从句用that引导。
9.C the directions 说明书，用复数。
10.D happen的主语一般是人或it; B需要去掉to; appear 没有这种用法；occur to 表示出现在头脑中。

11.A hold back妨碍；hold up 延误，耽搁
12.C wait发生在realize之前，与句子主语构成主动关系，因此用现在分词完成时。
13.A in---direction 在---方向
14.A tear down 撕毁，撕掉
15.D manage it 设法对付，设法完成

三、
1.去掉on 　last前面不能加介词
2.took-----taketake photos和go for a walk是平行结构
3.在camera前面加 a/my　camera是可数名词
4.did-----went go意为“进展”
5.badly----bad turn是系动词，其后应接形容词
6.lately----late　 lately意为“最近”，late意为“晚的”
7.ran----running　 go on doing表示“继续做某事”
8.在第一个the 前面加to　get to表示 “到达”
9.正确
10.that----which　 that不能引导非限制性定语从句
 
 

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