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While dog keepers realize their dogs can read their moods accurately,scientists have always bee...

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while    when    as    since  
look at    look after    look up    look out  
look after   look through   look into   look like  
since    until    while    after  
acute    cautious    flexible    valid  
While I walked the dog    While I walking the dog    While walking the dog   While I am walking the dog .  
since    until    while    after  
look at    look after    look up    look out  
look    looks    looking    looked  
until    while    since    after  
you    that   不填    it  
as  which  that  while  
Because   While   As soon as   Until  

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