Do you happen to know ________? 
#69838
A
whereisheraddress
B
inwhichplaceisheraddress
C
whatheraddressis
D
theplaceheraddressis
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I have two grammars, ______are of great use. 
#73806
A
all of which
B
either of which
C
both of that
D
both of which
 It was quite a serious accident, _____ caused by careless driving.
#72311
A
which I think was
B
I think which was
C
which I think it was
D
I think which it was