11. You should take more ___. Don’t always sit at the desk busy doing your___.
A. exercise, exercise  B. exercises, exercises
C. exercises, exercise  D. exercise, exercises 
【答案】D exercise作“运动”讲时，是不可数名词；作“练习”讲时，是可数名词，有复数形式。本句第一空为“多做运动”，第二空为“练习”。
12. Li Ling wants to be a singer. She thinks it’s an interesting_______.
A. work  B. job  C. art  D. caree
【答案】B 本题考查名词辨析。由an修饰可数名词，可知应选job。
13. The _______now is that we have lots of _______to ask.
A. problem， questions   B. question， problems
C. question， problem D. problem， question
【答案】A 考查近义词。Question常与ask连用，如ask the question，不定式短语to ask在这里作定语修饰前面的名词question，因为question是可数名词，所以应为questions。
14. At the foot of the hill you could hear nothing but the _______of the running water.
A. shout B. noise    C. voice D. sound
【答案】D sound指人所听到的、自然界的任何声音，题意为“流水声”。
15. _______are going to come to my home tonight.
A. My brotherexercises three friend  B. My brother of three friends
C. Three my brother’s friend.   D. Three friends of my brother’s
【答案】D 本题题意为“我弟弟朋友们中的三个”表示整体中的一部分，用双重所有格。
16. Have you heard ______ news？The piece of _______ petrol is going up again!
A. the, the  B. 不填，the  C. the, 不填  D. 不填，不填
【解析】C 听说那个消息，特指后面的石油价格上涨，所以用定冠词；石油不可数名词，所以不用任何冠词
17. We went right round to the west coast by ______ sea instead of driving across ______ continent.
A. the; the   B. 不填；the   C. the; 不填   D. 不填；不填
【解析】B by +交通工具中间不用任何冠词；与水路对应，专指陆路，所以用定冠词the.
18. --- I am so sorry to have come late for the meeting.
--- It is not your fault. With __ rush-hour traffic and __ heavy rain, it is no wonder you were late.
A. a; a  B. the; the  C. /; /  D. /; a
【解析】A 一种...样的交通状况用a;这么一场大雨，泛指，用a.
19. I ate _________ sandwich while I was waiting for _________ 20:08 train.
A. the, a   B. the, the   C. a, the   D. a, a
【解析】C 我吃了一个三明治，一般所指；特指哪一列火车，用定冠词the.
20. In the United States, there is always ____ flow of people to areas of ______ country where more jobs can be found.
A. a; the  B. the ; a  C. the; the  D. a; a
【解析】A一群人流，a flow of 固定搭配；特指能找到工作的那个地方，所以用定冠词。