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What _______ when I called?

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I promise that I (not/ come) _______ late.

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Alice _______ the accident when she was catching the bus.

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The prerequisite condition for a/an _______ planet is water supplies, appropriate temperatures and breathable air.

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The _______ can fall below zero degrees Celsius in winter.

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_______ believe there will be life on Venus in the future?

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When I _______ breakfast, the phone suddenly _______.