—What’s ______ most useful invention in the 20th century? —_____

—What’s ______ most useful invention in the 20th century? —______ computer, I think.

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I can ride ________ bike but I can’t ride __________ horse.

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a; a

Yang Lei had ______ unusual experience in Gansu Province. ______ experiencechanged her life.

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We can have_______ bluer sky if we create________ less polluted world．

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We stayed at a very nice hotel. But I can't remember _________ name of it.

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the

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Many young people play ___________ soccer in their free time.

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