________ we started thinking and believing we could do it, anything was possible.
[     ]
A．As  
B．While
C．Until  
D．Once

-Don't hesitate to buy the dress if you like the design and pattern.
-No, I won't, ________ the price is reasonable.

[     ]
A．as soon as  
B．as well as
C．as far as  
D．as long as
Tim is in good shape physically ________ he doesn't get much exercise.
[     ]
A. if  
B. even though
C. unless  
D. as long as
-Some Chinese students find it hard to adapt to the life when in London.
-Exactly, ________ they've learnt a lot about the city before.
[     ]
A．if only  
B．now that
C．as though  
D．even though
He has been playing all afternoon ________ getting on with his work.
[     ]
A. other than  
B. more than
C. rather than  
D. less than
________ both sides accept the agreement will a lasting peace be established in this region.
[     ]
A. If only
B. Only if
C. Unless
D. As long as
In time of serious accidents, we know some basic things about first aid,        we can save lives.   
[     ]
A．whether      
B．until    
C．if          
D．unless
There are many things to consider when you are looking for a house, ____ to buy or just intend to rent.   
[     ]
A．though              
B．although    
C.   if                    
D．whether
It was some time        we realized the truth.    
[     ]
A．when    
B．until    
C．since    
D．before
Scientists say it may be five or six years         it is possible to test this medicine on human patients.      
[     ]
A. since                        
B. after      
C. before                      
D. when
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