My sister doesn't like bread. She won't eat it ____________she is very hungry.          
[     ]
A. if        
B. when        
C. as        
D. unless
Though it was late _____Mr Keller went on with his work.        
[     ]
A. but            
B. and          
C. so            
D. /
--Why does he like koalas?
--        he thinks they are very cute.
[     ]
A. Because
B. So    
C. But    
D. And
I'll wait here           he comes to see me.    
[     ]
A. after    
B. until    
C. while    
D. as soon as
______ he comes, we won't be able to go.
[    ]
A. Without          
B. Unless
C. Except            
D. Even
He was too tired    _     doing the housework. 
[     ]
A. because of          
B. because
C. so                  
D. to
-How do you like the concert given by the "Foxy Ladies"?
-Exciting. _____ one piece of music wasn't played quite well.
[     ]

A. so
B. though
C. because
D. and

I study hard          I can catch up with my classmates.    
[     ]
A. so that        
B. because    
C. in order to      
D. as
The English book was so interesting that he had read it for 3 hours_________he realized.    
[     ]
A.   when    
B．until    
C．before    
D．after
I can't go to school today,         I got a bad headache last night.            
[     ]
A. and          
B. or            
C. because        
D. so
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