．You’d better get the problem solved as soon as possible ______ it becomes out of control．
#33130
A
when
B
before
C
since
D
unless
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It won’t be quite a long time ________ your son is back, so don’t be worried.
#32772
A
that
B
since
C
before
D
until
----Have you got the result? ----No, It will be some time ________we know the result.
#34360
A
when
B
since
C
if
D
before
After living in the city for 10 years he returned to the small village ______ he grew up as a child.
#34486
A
which
B
where
C
that
D
when