________ the police thought he was the most likely one，since they had no exact proof about it，they could not arrest him.

A．Although  B．As long as

C．If only  D．As soon as

The medicine works more effectively ________ you drink some hot water after taking it.

A．as  B．until  C．although  D．if

Owen wouldn't eat anything ________ he cooked it himself.

A．until  B．since  C．unless  D．while

You will be successful in the interview ________ you have confidence.

A．before  B．once  C．until  D．though

People who are really in need of houses will suffer heavy losses ________ the government takes measures to bring down house prices.

A．if  B．in case  C．unless  D．since

________ hard one may work, one cannot master a foreign language in a month or two. 

A．Whenever  B．Wherever

C．Whatever  D．However

________ I really don't like art, I find his work impressive.

A．As  B．Since    C．If  D．While

________ he has limited technical knowledge, the old worker has a lot of experience.

A．Since  B．Unless   C．As     D．Although

The village has developed a lot ________ we learned farming two years ago.

A．when  B．which  C．that  D．where

—Where's that report?

—I brought it to you ________ you were in Mr.Black's office yesterday.

A．if  B．when  C．because  D．before