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 Come and have a look. We have sweaters      red, yellow and blue     10 yuan.
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at, at
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on, for
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in, for
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on, at
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An terrible earthquake happened          the Indian ocean          a spring afternoon.
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on; in
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in; on
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on; on
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in; in
The 31st Olympic Games will take place in Brazil ______ 2016.
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at
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on
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in
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by
Jack’s sister has been a tour guide _______two years ago.
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for
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since
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—What’s your speech        , Dr．Smith ?—Tomorrow you will get it．
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by
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of
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from
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on
We should protect the animals ______danger.
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on
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in
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of
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at