21.The mother didn't know ______ to blame for the broken glass as it happened while she was out.

　　 A. who　　 B. when　 C.how　　 D. what　　 (NMET2002 24)

20. Meeting my uncle after all these years was an unforgettable moment,_____ I will always treasure.

　　 A. that　　 B.one　　 C.it　　　 D.what　　　　 (NMET2002　 35)

19.Dorothy was always speaking highly of her role in the day,___,of course, made the others unhappy.

　　 A.who　　 B.which　　　 C.this　 D.what　　　 (NMET2000　 17)

18._____ is known to everybody, the moon travels round the earth once every month.(NMET2001　 34)

　　 A.It　　　　　　　 B. As　　　　　　　 C.That　　　　　 D.What

17.The film brought the hours back to me ______ I was taken good care of in that far-away village.　

　　 A.until　 B.that　　　 C.when　 D.where　　　 (NMET2001　 22)

16.They Parkers bought a new house but _______ will need a lot of work before they can move in.　

　　 A.they　　 B.it　　　　 C.one　　　　 D.which　　　 (NMET2001　 25)

15.One of the sides of board should be painted yellow, and_____.(NMET2001春招)

　　 A.the other is white　　 B.another white　　 C.the other white　　 D.another is white

14.---Why don't we have a little break?

　　 ---Didn't we just have______.(NMET2000　 23)

　　 A.it　　 B.that　　 C.one　　 D.this

13.If you want to change for a double room you'll have to pay____ $15. (NMET2000　 16)

　 A.another　　 B.other　　 C.more　　 D.each

12.--- Do you want tea or coffee?

　　 ---____. I really don't mind.　　　　　　 (NMET2000春招　 6)

　 A. Both　　　 B. None　　 C. Either　　 D. Neither