— How I wish we studied ________ there are fewer exams!      
— You're joking!
[     ]
A. where    
B. in which  
C. the place where  
D. in where
______ we can't remove our troubles in life for ever, we can leave them behind when we are on vacation.
[      ]
A. When      
B. While      
C. Unless    
D. Until    
Scientists say it may be five or six years ________ it is possible to test this medicine on human patients.  
[      ]
A. since    
B. after    
C. before    
D. when  
How the loans are paid should be of little concern to the bank ________ they are paid on time.   
[     ]
A. as well as    
B. as soon as    
C. as long as      
D. as far as
You are sure to make great progress________you stick to your plans for your study.
[     ]
A. in case  
B. as long as  
C. even though  
D. so that
Unlike watching TV, reading is a highly active process________it requires attention as well as memory
and imagination.
[     ]
A. until  
B. but  
C. unless  
D. for
________you have decided to go, you’d better leave at once in order to avoid the rush hour.
[     ]
A. Now that  
B. Unless  
C. Although  
D. Even if
-The mountain village is so beautiful.
-Yes.Moreover，________the villagers live，there is fresh air.
[     ]

A．that  
B．where  
C．when  
D．whether

I didn't realize my mistake________my teacher had a face-to-face talk with me.
[     ]
A. until  
B. after  
C. since  
D. when
Experts are trying to work out a plan to deal with the problems caused by global warming________
it is too late.
[     ]
A .when  
B．if  
C．before  
D．until
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