21．____ she couldn’t understand was _____ fewer and fewer students showed interest in her lessons.

A. What, why　 B. That, why　 C. What, because　 D. Why, that　

( 2001年上海卷 --- 27 )

20．Eat _____ you like and leave the others for _____ comes in late.

A. any, who　 B. every, whoever　 C. whichever, whoever　 D. either., whoever　

(　 2000春上海卷 ----7 )

19．___ helped to save the drowning girl is worth praising.

A. Who　 B. Anyone　 C. Whoever　 D. The person　 ( 99年上海卷 --- 3 )

18．What the doctors really doubt is ____ my mother will recover from the serious disease soon.

A. when　　 B. how　　 C. whether　　 D. why　　 (　 2001春上海卷 ---- 29 )

17．Little Tommy was reluctant to tell the schoolmaster ____ he had done the day before.

A .that　 B. how　　 C .what　 D. where　　 (　 2001春上海卷 ---- 31 )

16．A computer can only do _____ you have instructed it to do.

A .how　 B. after　　 C. what　 D .when　　 ( NMET2001 --- 31 )

15．Shanghai has taken on a new look. It isn’t like _____ it used to be .

A .what　　 B. how　 C. that　 D.　 which　

14．It worried Mary a lot _____ she would pass the college entrance examination.

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

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

A .while　　 B. if　　　 C .for　 D. that　 ( NMET92 --- 29 )

12．_____ caused the accident is still a complete mystery.

A. What　　 B . That　　 C. How　　 D. Where　 (98年上海卷 --- 5 )