isveryimportantandactionshould

is very important and action should be taken to keep mountain climbers .

A．Safe; safety	B．Safety; safely
C．Safety; safe	D．Safe; safely

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A．lonely; alone

B．lonely; lonely

C．alone; lonely

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A．is; has

B．are; with

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A．shall come

B．is going to come

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—— No, but I think he ______ in half an hour.

A．come back

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C．comes back

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