In my opinion，of all the books，this is the only one ____________is well worth reading.
| A． |
who |
B． |
that |
C． |
whom |
D． |
what |
Which of the following words can NOT be added the prefix "un_______" to give it the opposite meaning？（ ）
A．happyB．healthyC．usualD．polite
A black young man named Sheku Kanneh﹣Mason is _________ enough to show that people of colour can take on any challenge of classical music．（ ）
A．modestB．humorousC．confidentD．curious
Because of the flood， there are _________ tourists in that ancient town this year than last year．（ ）
A．moreB．mostC．fewerD．fewest
Yao Ming， a basketball giant ， ___________ water polo when he was young．（ ）
A．is playingB．used to play
C．is used to playingD．was playing
When I think of the worried _______ of foreign students who are learning Chinese， I can go to study English calmly．（ ）
A．looksB．designsC．effortsD．needs