It is nice to do something for someone else out of the blue and not to expect anything ______.     
#25545
A
in relief
B
in return
C
in turn
D
in need
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After we talked about it for a long time, he agreed to help us ______.
#26298
A
at an end
B
in the end
C
as usual
D
at present
I have offered to work for the store owner _____ one night’s stay.
#29005
A
in place of
B
in exchange for
C
in relation to
D
in preference to