You can arrive in Beijing earlier ______ you don’t mind taking the night train.
A. provided
B. unless
C. until
D. because
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Helen listened carefully _____ she might discover exactly what John wanted.
A. so as that
B. in case
C. providing
D. in order that
The cost of living in Glasgow is among the lowest in Britain, _____ the quality of life is probabaly one of the highest.
A. since
B. when
C. as
D. while
______ sympathize, I can’t really do very much to help them out of the difficulties.
As long as
B. As
C. while
D. Even
We had to be patient because it _______ some time _____ we got the full result.
A. has been; since
B. had been;until
C. was; after
D. would be; before