Our government has taken some measures to overcome the lack of electricity, b

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Our government has taken some measures to overcome the    lack of electricity, but it may take
some time ____ we   have enough power.    [     ]
A. since
B. after
C. unless
D. before

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举一反三

Peter was so excited ____ he received an  invitation from his friend to visit Chongqing.   [     ]
A. where
B. that
C. why
D. when

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It really seemed ages ____ the police came on the scene and looked for the evidence.     [    ]
A. before
B. after
C. when
D. as

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They worked hard ____ they mightsucced.    [     ]
A. so that
B. euen if
C. if only
D. in case

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Most  children need encouragement in time of failure ____ they can cheer upagain.    [     ]
A. in case
B. so that
C. because
D. if

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I"d like to arrive 20 minutes early ____ I can have time    for a cup of tea.    [     ]
A. as soon as
B. as a result
C. in case
D. so that

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