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We know the famous ones—the Thomas Edisons and the Alexander Graham Bells—but what about the less ...

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know of; know    know; knew of    know; knew to    know of; knew with  
I don' t know exactly why, either.  I guess we are wrong this time.  I know. But perhaps you don' t know why.  George, you know, is one of the hardest working students among us.  
ends    results    effects    causes  
if    that    whether    when  
one    ones    them    it  
when     what    whether     if  
didn’t know    havn’t known    don’t know    hadn’t known  
I don’ t know exactly why, either.  I guess we are wrong this time.  I know. But perhaps you don’ t know why.  George, you know, is one of the hardest working students among us.  
has worked    worked    had worked    works  
pretend  admit  insist  imagine  
if    that    whether    when  
ends    results    effects    causes  
I don' t know exactly why, either.  I guess we are wrong this time.  I know. But perhaps you don' t know why.  George, you know, is one of the hardest working students among us.  
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