On returning from work, _____.  
#70204
A
John found a letter in the mailbox
B
a letter was found in the mailbox  
C
a letter was in the mailbox
D
the mailbox had a letter in it
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He said that the key _____ to open the door had been lost.
#74391
A
with what
B
with it
C
with that
D
with which
.If their marketing plans succeed, they ____ their sales by 30 percent.
#68240
A
will increase
B
have been increasing
C
have increased
D
would be increasing