You should make it a rule to leave things _______ you can find them again. 
#70500
A
when
B
where
C
then
D
which
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The problem lies ___ she knows little English.
#73620
A
that
B
in the fact
C
in fact that
D
in the fact that
___ he will come is certain.
#73626
A
What
B
That
C
Whether
D
If