In time of serious accidents, we know some basic things about first aid,

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In time of serious accidents, we know some basic things about first aid,        we can save lives.   [     ]
A．whether
B．until
C．if
D．unless

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举一反三

There are many things to consider when you are looking for a house, ____ to buy or just intend to rent.   [     ]
A．though
B．although
C.   if
D．whether

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It was some time        we realized the truth.    [     ]
A．when
B．until
C．since
D．before

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Scientists say it may be five or six years         it is possible to test this medicine on human patients.
[     ]
A. since
B. after
C. before
D. when

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Please remind me            he said he was going. I may be in time to see him off.    [     ]
A. where
B. when
C. how
D. what

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－Where  is that report?
－I brought it to you          you were in Mr Black"s office yesterday.       [     ]
A. if
B. when
C. because
D. before

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