21. The Second World War _____ millions of people were killed ended in 1945.

A. when　 B. during that　 C. in which 　　　　　　 D. which

20. Antarctic _____ we know very little is covered with thick ice all the year round.

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

19. He has lost the key to the drawer _____ the papers are kept.

A. where 　　　　　　　　　　　 B. on which　　　　　　　　　 C. under which　 　　　　　 D. which

18. This is the largest clock in the world, ____ the minute hand is six metres long.

A. that　　 B. of which　　 C. which　　　 D. whose

17. Both the girl and her dog ____ were crossing the street were hit by a coming car.

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

16. With the development of agriculture, the people _______village I taught before have lived a happy life.

A. who　　 B. whose　　 C. in whose　　 D. in which

15. I’ll talk about a newly-opened market ______ you may get all _______ you need.

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

14. Last month, part of Southeast Asia was struck by floods, from _______effects the people are still suffering. A. that　　　 B. whose　　　 C. those　　　 D. what

13. The schools themselves admit that not all children will be successful in the jobs ______ they are being trained. A．in that　　　　　　　　　　　　　　　　 B．for that　　　　　　　 C．in which　　　　　　　 D．for which

12. Many people who had seen the film were afraid to go to the forest when they remembered the scenes ______ people were eaten by the tiger.

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