Please call me ______ 289-6578. 
#47561
A
in
B
for
C
on
D
at
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We should throw the rubbish into the dustbin ______ protect our environment. 
#49489
A
as a result
B
so that
C
in order to
D
in order not to
Mr. Brown buys some pens and notebooks _______.
#48092
A
for we
B
for us
C
to we
D
to us
What are you doing _____ vacation?
#48594
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for
B
in
C
on
D
at