1 . The sight, hearing and other senses of wild animals are much better than_______of a human.

A．that

B．those

C．which

D．what

2 . Last month I came to Britain. My English has improved a lot _______ I use it all the time.

A．unless

B．while

C．when

D．as

3 . It was not ______ he took off his dark glasses ______ I realized he was Liu Xiang.

A．when; that

B．until; when

C．when; then

D．until; that

4 . --- Time passes quickly, doesn’t it?
--- Yes. It will be only two months_______we take the 2010 College Entrance Examination.

A．since

B．after

C．before

D．When

5 . You can make a complaint to the local government ____you are happy with the way things are.

A．unless

B．if

C．once

D．as

6 . Peter was sure that_________he drank any more of this good red wine he would fall asleep.

A．if

B．when

C．as

D．since