— I rang you at about nine, But there was no reply.
— Oh, that was probably ______ I was seeing the doctor.
[     ]
A. why
B. when
C. what
D. that
____ the water pollution, the local government has taken action to deal with it.  
[     ]
A. As with      
B. As for            
C. As if      
D. As though
Why not seize it _____ you've got such a good chance?
[     ]
A. now that  
B. that    
C. where    
D. which
— Shall we pay a visit to the Great Wall tomorrow morning?
— ____ it rains.
[     ]

A. If             
B. Until            
C. since            
D. Unless

When his dad died, he felt          his world had turned upside - down. 
[     ]
A. in case
B. as if
C. so that
D. even though
We'd better set off now or it will be dark ______ we know it.
[     ]
A. before      
B. as            
C. when            
D. because
        advertisements are of great help, I don't think we should entirely rely on them. 
  [     ]
A. Since      
B. While          
C. Because        
D. As
His father got him a job in a bank but soon it became clear          he was not fit for that kind of work.
[     ]
A. why
B. what
C. whether
D. that
— Did you receive the letter the next day?  
— No. Somehow, it was three weeks ______ I received it.
[     ]
A. since        
B. when  
C. that  
D. before
— Did your boss phone you again the next day?  
— No, it was a fortnight ____ he gave me a second call.  
[     ]
A. that            
B. when       
C. before        
D. since    
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