20. Every boy and every girl as well as some teachers who______ to visit the museum ______ asked to be at the school gate before 6:30 in the morning.

　 A. are; are　　　　 B. are; is　　　　　　　　　 C. is; is　　　　　　 D. is; are

19. Jerry is such a lazy man ______ nobody wants to work with______.

　 A. as; him　　　　 B. that; 不填　　　　　　 C. whom; him　　　 D. as; 不填

18. -______when has the country been open to international trade?

　　 -1978, I suppose.

　 A. Since　　　　　 B. In　　　　　　　　　　　　 C. From　　　　　 D. After

17. You are required to find out ______ the differences between American English and British English lie.

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

16. Believe it or not, it is ______ that causes your illness.

　 A. because of your being overweight　　　　　 B. because you are overweight

　 C. you are so overweight　　　　　　　　　　　　　 D. your being overweight

15. “Can you read?”, Mary said ______ to the notice.

　　 A. angrily pointing　 B. and point angrily　 C. angrily pointed　 　　　 D. and angrily pointing

14. We are so happy to see that some of the students have already learned enough English to ______ a conversation.

　　 　A. hold on　　　　　 B. keep on　　　　 C. go on　　　　　 D. carry on