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It was only after he had read the papers    Mr.Gross realized the task before him was extremely di...

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he found    he had found    did he find    was he found  
when    that    which    what  
he had read    did he read    he read    was he reading  
did he set about learning    did he set out learning    had he set about learning    had he set out learning  
he realized    he had realized    had he realized    did he realize  
he had read    had he read    he did read    did he read  
when    that    which    what  
he knew   he had known   had he known   did he know  
he freed    he had freed    did he free    had he freed  
he realized    he had realized    had he realized    did he realize  
does he improve   had he improved   he had improved   he will improve  
that he began    he began    had he begun    did he begin  
when    that    which    what  
when    that    which    what  
between, and    not only, but also    not, but    both, with  
unless    if    after    before  
when    that    which    what  
when   that   which   what  

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