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Many people believe we will face environmental disasters _________ we completely change the way we live.
#57124
A
but
B
though
C
unless
D
until
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Our math teacher is very kind ______ he looks very serious.
#56434
A
because
B
though
C
if
D
when
It’s a lovely day today!  ______ go out for a walk?
#56989
A
Why don’t
B
Why not you
C
Why not
D
Why
He met many problems------ he was going over his lessons.
#57608
A
before
B
as soon as
C
since
D
while
—______ do you usually go to bed? —At six.
#55702
A
What time
B
How time
C
When
D
A and C
 Three years has passed _________ they came to this school.
#55246
A
since
B
for
C
when
D
before