21. Do not let any failures discourage you, for you can never tell_________close you may be to victory.

A. how B. that C. which D. where

22. China Today attracts a worldwide readership,________shows that more and more people all over the world want to learn about China.

A. who B. whom C. that D.Which

23.______the students came from different countries, they got along quite well in the summer camp.

A. While B. Unless C. Since D. Until

24.________you said at the meeting describes a bright future for the company.

A. When B. How C. What D. That

25. The number of smokers,_______is reported, has dropped by 17 percent in just one year.

A. it

B. which

C. what

D. as

26. It is so cold that you can’t go outside_______fully covered in thick clothes.

A. if

B. unless

C. once

D. when

27. The only way to succeed at the highest level is to have total belief__________you are better than anyone else on the sports field.

A. how

B. that C. which D. whether

28. Some experts think reading is the fundamental skill upon_______school education depends.

A. it

B. that

C. whose

D. which

29.____________scientists have learned a lot about the universe, there is much we still

don't know.

A. Once

B. Since C. Though

D. Unless

30.________struck me most in the movie was the father’s deep love for his son.

A. That

B. It

C. What

D. Which

31._________the job takes a significant amount of time, most students agree that the

experience is worth it.

A. If only B. After

C.Although D.In case