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People like to play ______ on each other on April Fool’s Day.

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We think that Mother's Day should be celebrated_______

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Auld Lang Syne is a song _______is sung on New Year’s eve.

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Can you tell me the reason for_______the Mother’s Day?

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________he come in half an hour, I shall go alone.

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What ............... should we take to reduce pollution?

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He lives in a very ............... village in Hue.

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n the United States, most people eat_______on Christmas day.