Thepossibilityofawayoutofthedi

The possibility of a way out of the difficulty never _____ to the captain and his crew.

A．happened

B．occurred

C．appeared

D．flashed

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A．did the sky turn dark	B．the sky did turn dark
C．turned the sky dark	D．was the sky turned dark

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—Not yet. I couldn't________on it with so loud music next door last night.

A．draw

B．devote

C．direct

D．concentrate

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A．required

B．acquired

C．inquired

D．inspired

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A．must be submitted

B．would be submitted

C．submits

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Tom is a promising student. I am sure that with his________effort, he will make a very successful scientist.

A．usual

B．constant

C．content

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