Scientists say it may be five or six years_______it is possible to test this medicine on human patients.
#92600
A
when
B
after
C
before
D
since
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It wasn’t until he came back _____ he knew the police were looking for him.
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As is reported, it won't take a long time ____ the 20th Golden Rooster and Hundred Flowers Film Festival falls in the Binhu New Area. Hefei.
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How long ______ we take part in the college entrance examination?
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Little did he care about his own safety,_______he was in danger himself.
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if
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though
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D
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