—What’s ______ most useful invention in the 20th century? —______ computer, I think.
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－Do you know______ man in white? －Oh, he is_________ scientist from America.
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a; a
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a; the
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Harry Potter and the Sorcerer’s Stone was such _____ most interesting novel that many children want to read it _____ second time.
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a; a
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the; a
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D
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