19. It is widely ______that smoking can cause cancer.

　 A. believed　 B.　 think　　 C. say　　　　 D. hoped

18. ____appeared to me that he enjoyed the food very much.

　 A. What　　　 B. It　　　　 C. All that　　 D. That

17.____all the inventions have in common is ____they have succeeded.

　 A. What; what　 B. That; that　 C. what; that　 D. That ; what

16. ____you don’t like him is none of my business.

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

15.____he will go to work in a mountain village surprises all of us.

　 A. What　 　B. That　 　　C. Whether　 D. If

14._____more countries can use natural energy in the future remains to be seen.

　 A. Whether　 B. This　 　C. who　 D. If

13.It worried her a bit _____her hair was turning gray.

　 A. while　 B. if　　 C. that　 D. for

12.____the meeting should last two days or three days doesn’t matter.

　 A. That　 　B. Whether 　C. If　 D. Where

11.Is _____he said really true?

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

10.The question came up at the meeting_____ we had enough money for our research.

　 A. that　 B. which　 C. whether　 D. if