— Could we practice playing the guitar in the hall, Sir ?                  —No , ___________ you have the principal’s (校长) note.        
#55372
A
if
B
unless
C
because
D
since
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Why ____________ enjoy Beijing opera with us?
#57628
A
not to
B
don’t
C
not
D
you don’t
 I don’t like running, _____I like swimming. 
#56237
A
and    
B
but   
C
with   
D
so