_____he has limited technical knowledge, the old worker has a lot of experience.
[     ]
A. Since
B. Unless
C. As
D. Although
It was believed that things would get worse, but _____ it is they are getting better.
[     ]
A. before
B. as
C. because
D. after
Don't look _____ the designer only _____ she is a woman. 　　
[     ]
A. down on; because of
B. upon down; because 　　
C. down upon; because
D. down upon; because of
You can't complain of being lonely _____ you don't make any effort to meet people.

[     ]

A. until
B. when
C. once
D. though
— I'm going to have lunch. Do you mind talking about your plan ____ lunch?
— All right. I'll wait here in the office.
[     ]
A. after            
B. before        
C. over               
D. until
In my point of view, the question is not _____ the world is going to have a new economic crisis,
but when.     
[     ]
A. that            
B. how  
C. what    
D. whether
_____ they decide whichcollege to go to, students should research the admissionprocedures.    
[      ]

A. As   
B.While    
C.Until    
D.Once

It seemed tome that she was in doubt ____   Timmy lived or died.  
[     ]
A. why    
B. how    
C. that    
D. whether
— I told you that he would come to see you.  
— Actually I had little doubt ____ it was true.  
[     ]
A. whether      
B. that        
C. since      
D. if
Though invited several   times, I still have some doubt ___ I can go to his   birthday party.    
[     ]
A. when      
B. where      
C. why          
D. whether
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