John promised his doctor he ________not smoke,and he has never smoked ever since. 
#101399
A
might   
B
should
C
could
D
would
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 You __________ to leave until you __________ your work.   
#102260
A
won’t be allowed; have finished
B
won’t allow; finish
C
won’t be allowed; will finish
D
won’t allow; will finish
—Bob has gone to California.—Oh, can you tell me when he        ?
#101937
A
has left
B
left
C
is leaving
D
would leave