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 I always sleep with windows open _______ it is too cold outside.
#55291
A
until
B
if
C
that
D
unless
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We had to stay at home ______ it was raining hard.
#56188
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of
B
because
C
because of
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as
A: _________ do you exercise? B: I exercise every day!
#56318
A
How
B
What
C
How often
D
How much
Don’t stop working _____ twelve. 
#58157
A
to
B
at
C
when
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until
Study hard,_______ you will not pass the exam.
#58185
A
and
B
or
C
but
D
so
—Would you like to go to the park with me?—I’d love to, ________ I’m afraid I have no time.
#55263
A
so
B
or
C
and
D
but