32.When it______ air pollution, Beijing faces the three “C” s-----cars，coal and construction，which lead to Beijing's thick air pollution.

A. refers to　　　　　 B. comes to　　　　　　　 C. happens to　　　　　 D. speaks to

31. ______ it have been the failure to pick up directions from the ground control that caused the air crash?

A. Must　　　　　　　　　 B. Could　　　　　　　　　　　 C. Would　　　　　　　　　　 D. Should

30. The one concern for parents and students is ______ if the student pursues their university education in a foreign country, the student will not have the opportunity to establish social contacts in China.[

A. what　　　　　　　　　　　　　　 B. that　　　　　　　　　　　　 C. whether　　　　　　　　 D. /

29.. Not until the train pulled into the next station ______ her suitcase gone.

A. Mary had found　　　　　　　　　　　　　　　　　　　　　　 B. had Mary found　

C. did Mary find　　　　　　　　　　　　　　　　　　　　　　　　　 D. Mary found

28. In class, fewer of the students who are not ___ their studies sometimes ____the dying robots

, not listening attentively.

　　 A. accustomed to ; are functioned as　 B. accurate in; function

C. sceptical of; are functioned　　 　　　　 D. addicted to; function as

27.Ladies and gentlemen, please ______ seated until the plane has come to a complete stop.

A. remain　　 　 B. keep　　 　　　　　　　 C. go　　 　　　　　　　　 D. get

26.Please do me a favor -______ my friend Mr. Smith to Youth Theater at 7:30 tonight.

A. to invite　　　　　　 B. inviting 　　　　　　　　 C. invite 　　　　　　　　　　 D. invited

25. ______ herself with other girls, she feels she is quite lucky.

A. Comparing　　　 B. Compared　　　　　　 C. To compare　　　　　 D.Being compared

24.- Lovely weather, isn’t it?

　 - Yes, a bit hot, ______.

A. although　　　　　 B. but　　　 　　　　　　　　　 C. though　　　　　　　　　　　　　　 D. yet

23. Canada has vast areas of wilderness, from the Arctic north, _______ average winter temperatures are usually -20 ⁰C, to the border with the USA in the south, _______ is said to be the longest border in the world not defended.

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