Wehavetoadmitthatthebiggestfac

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We have to admit that the biggest___________ facing the ecosystem is limited resources and the worsening environment.

A．mission

B．challenge

C．scale

D．contribution

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I thought her nice and honest ____ I met her. But as time went on, I knew that she was very selfish.

A．at first	B．at the moment
C．the first time	D．for the first time

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He commanded the students _____ the classroom before he returned.

A．not leave	B．didn’t leave
C．wouldn’t leave	D．needn’t leave

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Do you remember those days _____ we spent along the seashore very happily?

A．when

B．who

C．where

D．that

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His inability to speak English put him at a _____ at the international meeting.

A．shortcoming	B．disadvantage
C．fault	D．weakness

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It looks _____ he is not so healthy as he used to be.

A．in case	B．ever since
C．even if	D．as if

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