18. This kind of plant ______ grass in appearance , so it's difficult for the students to tell them.

A. reflects B. instructs C. resembles D. shapes

19. Experts suggest that young parents ______ some time to communicate with their children instead of spending much time playing games on the phone.

A. set aside B. put away C. make up D. account for

20. ______ with all sorts of affairs, the manager had little time to have a good sleep.

A. Occupying B. Being occupied

C. Occupied D. Having occupied

21. With the help of curriculum reform, students enjoy a variety of after-school activities, ______ up to half are aimed at strengthening their physical strength and building up their confidence.

A. to which B. of which C. from which D. in which

22. -When shall we set about doing our work?

-______ all the group members are here.

A. Until B. Since C. Unless D. Not until

23. Many experts hold the view ______ teacher's development is ______ the key to better education lies in.

A. that; which B. that; what C. that; where D. which; where

24. The study shows that smoking may generate long-term stress, even if people feel it offers them ______ relief from tough situations.

A. temporary B. original C. primary D. appropriate

25. -Thank Goodness! We have completed our task before the deadline. It is very kind of you to help us.

-______.

A. With pleasure B. That's all right C. By all means D. OK

26. -It's already 11 o'clock , and he ______ have been here half an hour ago.

-Maybe he got caught in the rain.

A. must B. ought to C. may D. can

27. I am always delighted to receive your letters. ______ being short, they bring much relief when I know that you are safe.

A. In terms of B. With regard to

C. On account of D. In spite of

28. Mr. and Mrs. Scott prefer a restaurant in a small town to ______ in so large a city as New York.

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

29. I would have attended your wedding anniversary, but one of my former classmates ______ to visit me, which was out of my expectation.

A. had come B. came C. was coming D. has come

30. ______, he does get annoyed with her sometimes.

A. Although much he likes her B. Much although he likes her

C. As he likes her much D. Much as he likes her