We have finished the work in time __________ your help.So we are very grateful for that.Which of the following is NOT proper?
#26438
A
thanks to
B
because of
C
as a result of
D
leading to
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 He is always helping people without expecting anything _____.
#26277
A
in common
B
in turn
C
in danger
D
in return
The railway will be opened______traffic___ May 1, 2009. 
#28351
A
to; on
B
to; in
C
by; on
D
for; on
Thank you for your help and I hope I can do something for you_____.
#27264
A
in return
B
in turn
C
in reply
D
by turns