________ 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
