单项选择题

It is imperative that the students（）writing their papers by the end of the month.

A．finish
B．must finish
C．will finish
D．are to finish

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Training astronauts（）not an easy thing.

A．are
B．is
C．were
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（）with the size of the whole earth, the highest mountain does not seem high at all.

A．When compared
B．Compare
C．While comparing
D．Comparing
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