．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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--Shall Mary come and play computer games?--No,__________ she has finished her homework.
#80320
A
when
B
if
C
unless
D
once
We really enjoyed Disneyland. We took all the rides, some of ________ twice, and had lots of fun. I felt just like a kid again.
#30765
A
which
B
that
C
it
D
them
(2013·甘肃兰州名校高三检测)The professor told me to start the research right now, ________ I was sure to fall behind.
#30546
A
or
B
so
C
but
D
and
Chuck Swindoll once said, “Life is 10% _____ happens to us and 90% _____we respond to it.”
#33668
A
who; why
B
what; how
C
which; when
D
that; that
I was about to get on the bus ____someone called me from behind.
#33059
A
until
B
whether
C
while
D
when