—What’s _____most useful invention in the 20th century? —_____ computer, I think.
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-- Are you _______ American or English? -- English. We both work in Shanghai.
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This is _______ usual way of solving the problem. Can you think of ________ unusual way?
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_ What ______ useful book! _ Is it _____ one that you borrowed from Mr Green yesterday?.
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—What do you usually have for breakfast?—A piece of bread and ________ egg.
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