Thescientistsarebeatingtheirbr

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The scientists are beating their brains trying to _______ a solution to the problem.

A．come about

B．come across

C．come out

D．come up with

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The policeman was ________ abusing his power when performing his duty, but it hasn’t been ______ yet.

A．charged with; confirmed	B．blamed for; approved
C．assessed ; proved	D．accused of; proved

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Only through constant practice can the ability of using a foreign language be _______.

A．earned

B．acquired

C．gained

D．achieved

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She ________ on her work so much that she didn’t notice that a crowd of people had _______around her.

A．focused; focused	B．fixed; gathered
C．concentrated; concentrated	D．carried; collected

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The doctor, ________ by several nurses, successfully performed the difficult operation on the patient.

A．aided

B．assisted

C．helped

D．guided

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People tend to live more happily and longer if they are ________ about life.

A．pessimistic

B．enthusiastic

C．optimistic

D．terrific

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