Read this story, _______ you will realize that not everything can be bought with money.
#31187
A
or
B
and
C
but
D
so
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Doctor Smith has made another wonderful discovery, _______ great importance. 
#30394
A
which I think is of
B
which I think it is of
C
which is I think
D
I think which is
We won’t give up _______ we should fail ten times.
#79781
A
even if
B
since
C
whether
D
until