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I think it’s_________ useful advice，so I will always remember it．  
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a
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an
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the
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This is _______ book I bought yesterday. Isn’t it ________ interesting one?
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the; the
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a; an
C
a; the
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the; an
Many young people play ___________ soccer in their free time.
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a
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an
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the
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Sandra works in a big factory. She’s_________worker.         
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a
B
the
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some
D
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Chongqing is ____________ lively city with many places to have fun.
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an
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a
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the
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-- What can I do for you? -- I want _______MP4 for my daughter.
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a
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an
C
the
D
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