4. Taobao. com is a free site, ____visitors can not just buy almost all kinds of products but open their own online shops.

A. whose　　　　　 B. which　　　　　 C. what　　　　　 D. where

[解析]选D。考查定语从句中引导词的判断。定语从句中缺少地点状语，故用where引导，修饰free site。

3. _____the employee’s working efficiency, the supervisor will allow them to have a coffee break.

A. Improving　　　　　　　　　　 B. To improve

C. Having improved　　　　 D. Improved

[解析]选B。考查非谓语动词作状语，此处用不定式作状语表目的，分词作状语一般不表目的，故选B。

2. You should try not to get_____in the trouble between them.

A. lost　　　　 B. absorbed　　　　　　　 C. trapped　　　　　 D. involved

[解析]选D。get involved in卷入……中；get lost迷失，陷入……；get absorbed被吸引……。

1. When talking about China, people often _____it with the Yellow River.

A. associate　　　　 B. worship　　　　　 C. line　　　　　 D. relate

[解析]选A。考查短语搭配。associate. . . with. . . 把……和……联系起来; line with沿……排列；relate与to搭配。

10. To my astonishment, everyone present took on a ____look hearing the____news.

A. surprised; expected　　　　　 B. surprising; expected

C. surprised; expecting　 D. surprising; expecting

[解析]选A。考查非谓语动词用作形容词时的词义辨析。第一个空意为“惊讶的，吃惊的”，用surprised; 第二个空意为“期待的，预料的”，用expected。故本题选A。

9. When you have finished the book, please ____it on the shelf.

A. replace　　　　　　　　　 B. take place

C. take place of　　　　　 D. in place of

[解析]选A。B项意为“发生”，为不及物动词短语；C项短语构成不对，应为“take the place of”，意为“代替，取代”，不符合题意；D项介词短语，不能作谓语。

8. -What a great success Shenzhou Ⅶ is!

-Yeah, our scientists must have done everything they can____it up.

A. send　　　　 B. sending　　　　　 C. to send　　　　 D. to be sent

[解析]选C。考查非谓语动词。everything后是省略了that及谓语动词do的定语从句，此处用不定式作状语，表目的，且send与scientists之间是主动关系，用不定式的主动形式，故选C。

7. Bill was doing a lot of physical exercise to build up his____.

A. ability　　　　　 B. force　　　　　 C. strength　　　　　　 D. energy

[解析]选C。考查名词词义辨析。build up one’s strength强身健体。strength力量；force力气，体力等；ability能力；energy精力，能量。

6. He stepped into the office, ____down and began to work at once.

A. sitting　　　　　 B. to sit　　　　　 C. having sat　　　　　 D. sat

[解析]选D。分析句子结构可知，空格部分在句中作并列谓语，故用sat。