Nobody knows for sure what effect global warming has ___ our environment in the long term.
#27352
A
of
B
with
C
for
D
on
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Early ＿＿＿the morning of May 1, we started off＿＿＿the mountain village.
#28773
A
in； for
B
in； t?
C
on；／
D
on； for
Jane is in a hurry because the train to the airport leaves _______ half an hour.
#25131
A
by
B
in
C
for
D
until