12. -There are several chemical plants around here.

-No wonder the water in the river is_______.

A. smell　 B. a smell　　　 C. smelly D. smelling

[解析]选C。由句子结构可知A项错误。a smell只表一种气味，但不一定是臭味。smelly臭的，难闻的；smell用作不及物动词表“发出恶臭味”，但常用一般时态。

11. -Jack wants to stay up and watch a football match on TV.

-Eleven o’clock is________hour that a boy of his age shouldn’t stay up.

A. such late an　　　　　　　 B. such a late

C. so a late　　　　　　 D. a so late

[解析]选B。在such/so. . . that. . . 句型中，常用结构有so+形容词+冠词(a/an)+名词或such+冠词(a/an)+形容词+名词，故只有B项符合。

10. Mr. Li______as a secretary in the company since he entered it.

A. has been serving　　　　　　　 B. has been served

C. is serving　　　　　　　　 D. had been serving

[解析]选A。have been doing sth. 一直在做某事，句中含有since引导的时间状语，多用完成时态，而且serve as要用主动语态。D项过去完成进行时，不符合语境。

9. -You look disappointed!

-I made a suggestion but they chose to_____ it.

A. ignorant 　 B. ignore

C. ignoring 　 D. ignorance

[解析]选B。答句意为“我提出了建议，但他们不予理会”。choose to do sth. 意为“选择做……”，所以ignore要用原形。

8. The price of meat reduced_______ 30% ________ 15. 5 yuan per kilogram because of the crisis(危机).

A. to; by B. by; to　 C. to; to　 D. by; by

[解析]选B。by表示下降的程度，而to则表示“下降到……”。句意为：由于危机，肉的价格下降了30%，下降到每公斤15. 5元。

7. -Have you heard any sound last night?

-Yes. At about 2 o’clock in the morning, a gun shot_______.

A. rang up　　　　　　 B. rang off

C. rang back　　　　　 D. rang out

[解析]选D。ring out突然响起(铃声、枪声)。ring (sb. ) up给……打电话；ring off挂断电话；ring back 回电话。

6. The policemen of Dongguan wrote down all the information_________ the case of many missing children.

A. is related to　　　　　　　 B. relate to

C. related to　　　　　　　　　 D. related

[解析]选C。related to形容词短语作定语修饰the information。句意：东莞的警察记下了所有与多名儿童失踪案有关的信息。

5. Several new events were_______ the program for the 2008 Beijing Olympic Games.

A. added to　　　　　 B. added up

C. adding　　　　　　 D. adding up to

[解析]选A。add. . . to. . . 把……加到……上去。句意为：2008北京奥运会新增加了几个项目。add up加起来，add up to总计。

4. Soon______was clear that he couldn’t stay in China forever, he had to play on the world’s big stages.

A. this 　　　　　 B. it　　　　 C. that　　　　　　 D. what

[解析]选B。it作形式主语，that从句是真正的主语。It was clear that. . . 很明显……。

3. I always cannot help_______ people in trouble a hand. But I am so busy today that I cannot help_______ the work with you.

A. to give; to do　　 B. giving; doing

C. give; do　　　　　　 D. giving; do

[解析]选D。考查非谓语动词。cannot help doing sth. 禁不住做某事；cannot help(to) do sth. 不能帮着做某事。