We were about to go out for a walk ________ it began to rain.
#33371
A
while
B
before
C
as
D
when
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They intended to have the school better equipped， the local government was not able to get enough money to do so.
#33208
A
unless
B
while
C
although
D
once
Experts are trying to work out a plan to deal with the problems caused by global warming ______ it is too late.
#31459
A
when
B
if
C
before
D
until
You can’t use my bike _____ you return it to me by the weekend.
#31644
A
if not
B
unless
C
because
D
though
—Mom, can I go out and play with my friends now?—No, honey, you can’t _____ you haven’t recovered from the knee injury.
#30180
A
until
B
before
C
as
D
unless