______ I was reading, he knocked at the door.  
[     ]
A. Since  
B. When  
C. For  
D. After
—So you were in the supermarket ______ you heard a strange sound, right?
—That's true. I ran out as quickly as possible.  
[     ]
A. when   
B. while 
C. then  
D. which
Do you know ______ he will be back?
I'm not sure. But ______ he comes back, I'll call you.
[     ]
A. that; if 
B. if; that  
C. that; that 
D. if; if
_______ they worked very hard, _______ they didn't finish their work. 
[     ]
A. Although; but  
B. Though; but 
C. /; and 
D. Although; /
—I called you yesterday, _____ nobody answered it. Where _____ you?
—Our family went to Hangzhou. 
[     ]

A. and; did     
B. but; was   
C. so; were   
D. but; were

-Hurry up. The bus is coming.    
-Wait a moment. Don't cross the street ________ the traffic(交通) lights are green.
[     ]
A. after
B. until    
C. while            
D. since
I want to know______ he'll arrive on time.
[     ]
A. that      
B.  when  
C. where  
D. if
You will do much better ___________ you are more careful.
 [     ]
A. if                
B. before
C. although        
D. unless
Emma failed her exams, I think she should work hard.
-I agree. ___________ she does, she'll get good grades.
 [     ]
A. If
B. Because
C. Before
D. Though
It’s a serious problem. We can't decide        Mr Wang comes back.
[     ]
A. while    
B. since      
C. until      
D. so
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