He had to stay at home _____________the heavy rain.
[      ]
A. because    
B. since     
C. because of  
D. so
We won't give up ______ we should fail twenty times.  
[      ]
A. even if        
B. since          
C. whether  
D. until
That was really a splendid evening. It's years ___ I enjoyed myself so much.
[      ]
A. when    
B. that    
C. before    
D. since  
_____ she was no more than twenty-two, she was already a highly successful business- woman.
[      ]
A. Though      
B. Once        
C. Because        
D. Since
________ you have finished your report, you can have it __________. 
[     ]
A. Now for; printing                    
B. Now that; printed 
C. So far; been printed                  
D. So that; being printed
Though they met for the first time, they talked________they were good friends.
[     ]
A. even if  
B. as if
C. even though  
D. if only
________ in health，he persisted in doing the experiment. 
[     ]

A．As he was poor  
B．Poor as he was
C．Poor was he  
D．Poor he was though

I didn't manage to do it ________ you had explained how.
[      ]
A. until  
B. unless
C. when  
D. before
The film is really wonderful.It's such a long time ________ I enjoyed myself so much.
[     ]
A. when  
B. before
C. as  
D. since
As is known, ________we know some basic knowledge concerning AIDS, we can protect
ourselves from being infected.
[      ]
A. as far as  
B. if only
C. so long as  
D. unless
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