All 5 children of the Blacks, _______ are now working abroad, will come back for their parents’ 50th wedding anniversary.
#68495
A
two of whom
B
two of them
C
both of whom
D
both of them
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I want to know ______the thief was caught on the spot.
#73997
A
which
B
that
C
what
D
whether
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
Do you know the man _______? 
#73787
A
whom I spoke
B
to who spoke
C
I spoke to
D
that I spoke