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. When the temperature is below zero, water will ____.

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. She gave him a ____ that she could not come to his party.

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. Don’t forget to ____ to let us know you arrived safely.

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. One of the main reasons for air pollution is that many cars __

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. On our way to Beijing, we visited Xi’an, a city of two million

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. The ____ left the ship after sixty hours of hard struggle.

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. ____ is usually the chief enemy of the camera lens.

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. The president of that company was very calm during the politic

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. These two horses look so much alike that we can not ____ one f

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. This watch is ____ by hand, not by machine, so it is very expe

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