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_____  English－English  dictionary can help you a  lot .
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A
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An
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/
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some
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I had       unusual day on my last school trip.
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a
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an
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/
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This is an             .  
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bag
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map
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— Can you ride ______bike?—Yes. What about going to the park by bike this coming Saturday?
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a
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I often have ____ egg and a glass of milk for ____ breakfast every day.
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an; /
B
a; /
C
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 His father is      engineer. He designed such     useful machine    
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a an
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an a
C
an an
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a a