--Are you sure ____ you have seen this man?---Yes, I’m quite sure ___that.
#71728
A
that, about
B
/, to
C
of, about
D
about. of
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________ is where he gets all his money from. 
#69169
A
What I can’t understand it
B
That I can’t understand
C
What I can’t understand
D
Which I can’t understand it
It was raining on the day_______ they arrived.
#69464
A
in which
B
on that
C
on which
D
where