Mark needs to learn Chinese _______ his company is opening a branch in Beijing. 
#67771
A
unless
B
until
C
although
D
since
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On returning from work, _____.  
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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
The book is meant to ________needs it .
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A
who
B
whoever
C
whomever
D
whom