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I had       unusual day on my last school trip.
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a
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—How do you go to ______ work?—I usually take ____bus．
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a，a
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the，/
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the，a
David comes from______ European country and he is ___honest boy.
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an;a
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a;an
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the;an
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—Do you know________woman in red? —Yes,she’s a professor of________university.
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the;a
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a;an
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the;an
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/;the
Everyone knows that _____ sun is in the center of the solar system（太阳系）
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a
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an
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the
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It is necessary to help____________ poor.
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the