---How is the weather in Xiamen?    ---Oh, it’s very hot ________ summer.
#48959
A
on
B
at
C
in
D
by
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He ____ his homework ____ Sunday.
#47859
A
doesn’t , on
B
don’t do, in
C
doesn’t do, on
D
don’t do, on
 It’s necessary _________ us _________ more trees in spring every year.
#45914
A
of; to plant
B
for; to plant
C
of; planting
D
for; planting