Let’s learn to use the problem we are facing________a stepping-stone to future success. 
#28724
A
to
B
for
C
as
D
by
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He came here ______ to discuss it with you.
#26070
A
on purpose
B
by chance
C
for purpose
D
on design
________ all my family, I sincerely thank you for what you have done for us.
#25441
A
On behalf of
B
In honor of
C
In case of
D
Instead of
We must show concern ______ each other. 
#28368
A
with
B
for
C
at
D
to