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No scientists can exactly figure out what ________ happened ________ at that time, which caused the extinction of the dinosaurs.

A．on earth; on the earth

B．on the earth; on earth

C．on earth; on earth

D．on the earth; on the earth

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The conference had been held to discuss the effects of tourism the wildlife in the area.

A．in

B．on

C．at

D．with

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--- How long are you staying?
--- I don’t know. .

A．That’s OK

B．Never mind

C．It depends

D．It doesn’t matter

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The building _______now beside the park was designed by a famous designer.

A．to be built

B．being built

C．built

D．building

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____ be sent to work there?

A．Who do you suggest	B．Who do you suggest that should
C．Do you suggest who should	D．Do you suggest whom should

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There was a terrible noise _____ the sudden burst of light.

A．followed

B．following

C．to be followed

D．being followed

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