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 |
—Where did you find your favorite shoes,Jackson?
—It was in the box______ my father often puts his shoes.
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Never before ______ to ______ what his parents expect of him more than it is today .
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.—Dear Sir, how can I remember the new words well?
—Try to ______ at least an hour each day for learning new vocabulary.
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.We arrived at the small town too late,almost at midnighe,we found there was no food ______as all the shops were shut.
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. —What would you give me in ______ for my mobile phone?
—My Mp5. Is it a deal?
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