They're busy ________ the computer for new analytical data.

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English words are easily forgotten unless ________.

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A．constantly repeated

B．constantly repeating

C．are constantly repeated

D．to be constantly repeated

The police arrived, ________ the situation became calmer.

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________ I think he is dishonest, but many people trust him.

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A．new type of camera for taking photos from space ________ now.

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Would you be ________ to let us know the date of your arrival?

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Before ________, the machine must be checked.

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What a terrible experience! ________, you're safe, that's the main thing.

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Not until all the fish died in the river ________ how serious the pollution was.

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A．did the villagers realize

B．the villagers realized

C．the villagers did realize

D．didn't the villagers realize

She sometimes becomes impatient if she's made ________ too long.

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