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—What’s _____most useful invention in the 20th century? —_____ computer, I think. 
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the, A
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Here is ______ e-mail from my friend.
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 “Will the charity show be ________ success?” I kept asking myself.
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My best friend Neil is ________ honest boy. You can believe him.                      
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Her daughter began to play _____piano when she was five. Now she's very good at it.
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--- Do you often ride _______ bike to school, Tom?--- No. I usually come to school by ______ bus.
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不定冠词(a,an)
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