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________ has helped to protect the environment is worth praising.

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They made laws that protect birds.  They taught young people, helped pass laws that protect animals and so on.  They tried to make the world better.  Both B and C.  
They made laws that protect birds.  They taught young people, helped pass laws that protect animals and so on.  They tried to make the world better.  Both B and  
have helped    helped    help    helps  
It has reduced the costs of medical treatment.  It has helped save the lives of most patients.  It has encouraged doctors to do more heart surgeries.  It have helped educate people about the prevention of heart disease.  
helps    helped    will help    has helped  
has been helped    had been helping    had been helped    has been helping  
Who    The one    Whoever    Anyone  
has been helped    had been helping    had been helped    has been helping  
They made laws that protect birds.  They taught young people, helped pass laws that protect animals and so on.  They tried to make the world better.  Both B and  
is helped    will be helped    was helped    has been helped  
help    helping,    having helped    being helped  
helps    helped    will help    has helped  
worked; for    helped; to    worked; on    helped; with  
helps    helped    was helping    has helped  
They made laws that protect birds.  They taught young people, helped pass laws that protect animals and so on.  They tried to make the world better.  Both B and C.  
The telephone has helped to save people from illness and fire.  The telephone has helped to prevent wars and conflicts.  The telephone has made the modern city neither better nor worse.  The telephone has had positive as well as negative effects on us.  
help  helps  helped  to help  
helping    help    have helped    having helped
  

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