19. My brother is very good　　　　 ping-pong.

A. in　　 B. for　　　 C. at

18. He has already worked for　　　　　　 hour.

A. the　 B. an　　　 C. a

17. He is very old, 　　　　　he still works very hard.

A. but　 B. if C. when

16. When I got to the top of the mountain, the sun　　　　　 .

A. was shining　　 B. shone　 C. has shone

15. What do you usually do　　　　　　 ?

A. in an evening　 B. in the evening　　 C. on the evening

14. 　　　　people attended the meeting last night.

A. A hundred of　 B. Hundred　　 C. Hundreds of

13. Mathematics 　　　　　　the language of science.

A. is　　 B. are going to be　　　　　 C. are

12. My aunt 　　　　to see us. She'll be here soon.

A. comes　　　 B. is coming　 C. had come

11. Who is 　　　　　of you three?

A. older　　　 B. oldest　 C. the oldest

10. Did you 　　　　　to his talk yesterday?

　A. hear　 B. heard　 C.listen