people say that ____ the year 2010,it will be 7 billion.by in for to

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people say that ____ the year 2010,it will be 7 billion.by in for to
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people say that ____ the year 2010,it will be 7 billion.by in for to
people say that ____ the year 2010,it will be 7 billion.
by in for to

people say that ____ the year 2010,it will be 7 billion.by in for to
是by,人们说到2010年为止,会有70亿.应该是说地球人口吧.