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It's     for us to study English, because it has become a widely-used language.

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The study of a group of monkeys in Japan.  The study of a Chimpanzee named Washoe.  The study of chimps using tools.  The study of termites' behavior.  
to study    study   s  
for; to study  of; to studying  for; studying  of; to study  
for, to study    of, to study    for, study    of, study  
Japan和Ja_pan  English和ENGLish  English和Engl  China和Chin  
how to study    when to study    which to study    what to study  
studying  study  studies  to study  
study  studies  will study  studied  
us to    we with    us for    us with  
us    to us    we    for us  
The US's Monsanto agreed with the results of Chinese scientists study  GM cotton is an ideal crop  The US's Monsanto dismissed the research for its own profit  Cotton bollworm has no resistance to Bt cotton over time  
study  to study  studying  studies  
两台发动机都是蓝系统  ENG2绿系统,ENG1黄系统  ENG2黄系统,ENGl绿系统  ENG2蓝系统,ENGl绿系统  
study   to study   studying   studied  
how to study   when to study   which to study   what to study  
to study    study    not to study    studying  
for, to study    of, to study   for, study    of, study  

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