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Our country has________a lot of advanced technology and management from abroad over the past thirty...

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to do  doing   do  to have done until seven o clock.  
has gone    has been    have gone    have been  
has changed ; well    changed ; good    has changed ; better    changed ; better  
led          introduced   brought  resulted  
Our country may become    May our country become    Our country becomes    Does our country become  
cheaper   cheapest   cheap   more cheap  
The blind is   The blind are   The blinds is   Blind are
  
cheaper  cheapest  cheap  more cheap  
has changed ; well    changed ; good      has changed ; better    changed ; better  
The blind is    The blind are   The blinds is    Blind are
  
march  develop   result  origin  
has gone    has been    have gone    have been  
will change    changed    changes    has changed  

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