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This detective story was written by a young writer.
Harvard,the  first American college  was founded in 1636 by them.
Nice pictures are drawn by my son.
She  is paid good money for her detective stories by them.

1.This detective story was written by a young writer.
2.America's first college,Harvard,was found in 1636.
3.Nice pictures are drawn by my son.
4.She is paid good money for her detective stories.