11). ( )either you or I going to the Great Wall tomorrow?

A.Is

B.Are

C.Am

D.Be

正确答案：B

12). When Jane fell off the bike, the other children ( )

A.were not able to help laughter

B.could not help but laughing

C.could not help laughing

D.could not help to laugh

正确答案：C

13). Never before that night ( ) the extent of my own power.

A.had 1 felt

B.I had felt

C.did I feel

D.I did felt

正确答案：C

14). Much( )， I think， should be paid to your English study so that you can pass the examination successfully.

A.influence

B.heart

C.approach

D.attention

正确答案：D

答案解析：attention。根据句子意思，此处用attention构成pay attention to短语，表示"注意…"

15). Who ( ) on Saturday?

A.do help you

B.you help

C.do you help

D.you do help

正确答案：C

16). I waited for him half an hour, but he never ( ).

A.turned in

B.turned down

C.turn off

D.turn up

正确答案：D

17). Alone in a deserted house， he was so busy with his research work that he felt( )lonely.

A.nothing but

B.anything but

C.all but

D.everything but

正确答案：A

答案解析：nothing but：只有。

18.Helen apologized for( )the party.

A.her not being able to attend

B.her being not able to attend

C.her being able not to attend

D.not her being able to attend

答案：A

19.The universe( )we know it might have begun with a great explosion.

A.as

B.that

C.and which

D.and

答案：A

20.James Cook，( )also discovered the Hawiian Islands.

A.by exploring the South Sea he reached Australia

B.explored the South Sea and reaching Australia

C.who explored the South Sea and reached Australia

D.explored the South Sea then reached Australia

答案：C