19. The factory _____ Mr. Li used to work was closed last week.

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

18. Have you visited the house _____ the famous scientist was born?

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

17. This is the school _____ Mr. Smith once taught.

　 A. in that　　　　 B. when　　　　　 C. where　　　　　 D. there

16. He is the most careful boy _____ I know.

　 A. what　　　　 B. which　　　　　 C. as　　　　　　 D. ./

15. Don’t go in, this is the shop _____ we have just been _____.

　 A. /, to　　　　　 B. that, /　　　　 C. where, to　　　　 D. which, there

14. Those _____ made no mistakes in today’s exercises please raise your hands.

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

13. The boy _____ has two lovely dogs.

　 A. who live next door　　　　　　　　 B. which lives next door

　 C. whom lives next door　　　　　　　 D. that lives next door

12. The man _____ was here just now is a doctor.

　 A. whom　　　　 B. who　　　　 C. /　　　　　　　　 D. he

11. This is the only article of these that _____ written by him.

　 A. was　　　　　　 B. were　　　　　 C. is　　　　　　　　 D. are

10. This is the best book _____ I have been looking for all this year.

　 A. who　　　　　　 B. whom　　　　　 C. which　　　　　　 D. /