Scientists say it may be five or ten years___________ it is possible to test this medicine on human patients.
#80316
A
since
B
before
C
after
D
when
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You can arrive in Beijing earlier for the meeting, ______ you don’t mind taking the night train.
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A
provided
B
unless
C
though
D
until
The news shocked the whole nation ____a strong earthquake hit Yushu on Apr．14, 2010．
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A
what
B
when
C
that
D
which
_____earth scientists understand how and why earthquakes happen, forecasts are usually inaccurate.
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A
As
B
While
C
Because
D
If
You may use the room as you like ________ you clean it up afterwards.
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A
as far as
B
so long as
C
in case
D
even if
—I’d like to invite you to my new house next weekend.—Thank you, but ____ I’ll have time I’m not sure at the moment.
#34533
A
when
B
as
C
in case
D
unless