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We can never expect ________ bluer sky unless we create________ less polluted world.

A．a; a	B．a; the
C．the; a	D．the; the

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Ashes from the fire fall on the ice surface and _______ more radiation from the sun.

A．take in

B．bring in

C．put in

D．go in

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As an employee, I couldn’t help but ______ still for hours as the boss told me to.

A．stood

B．stand

C．to stand

D．standding

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Julie was good at German, French and Russian, all of _____ she spoke fluently.

A．who

B．whom

C．which

D．that

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The scientific research on how to protect the rare animals is ________. Many scientists are working hard to find new way to raise the animals by man.

A．in danger

B．in control

C．in order

D．in progress

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Michael __________ here to see you and he____________ a note on your desk.

A．has come; had left	B．has been; has left
C．has come; left	D．has been; left

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