____ he is determined to do something, no one is able to persuade him to ____.
[     ]
A. If; give away
B. Although; give in
C. As long as; give out
D. Once; give up
My parents were quarrelling about me ____ I could not quite tell why.
[     ]
A. since
B. though
C. if
D. until
John thinks it won't be long ____  he is ready for his new job.   
[     ]
A. when    
B. after    
C. before    
D. since
I'll never forget such a beautiful place _____ I spent my childhood there with my grandma.

[     ]

A. that
B. although
C. where
D. because
You may use room as you like ____ you clean it up afterwards.
[     ]
A. so far as
B. so long as
C. in case
D. even if
____ you read English easily, you’ll find it’s another cup of tea to make conversation in English.  
[     ]
A. Because      
B. As though      
C. Even if      
D. Whether
The world is changing fast.I strongly believe that one will easily fall behind____he keeps on leaming.    
[     ]

A. unless    
B. if    
C. when    
D. as

All the substances,______ solids,liquids or gases,are made up of entirely atoms.  
[     ]
A. whether they                                
B. whether    
C. whether are they                            
D. whether are
The piano in the other shop will be _____,but ______    
[     ]

A. cheaper;not as better                    
B. more cheap;not as better    
C. cheaper;not as good                      
D. more cheap;not as good

All the photographs in this book, _______ stated otherwise, date from the 1950s.
[     ]
A. unless    
B. until    
C. once    
D. if
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