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In most parts of the world,many students help their schools make less pollution(污染). They join “en...

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in all parts of the world  in some parts of the world  from all corners of the world  from every corner of the world"  
power    energy    force    strength  
is serving    is served    serves    served  
most famous  the most famous  m  
knocked over   knocked about   knocked out   knocked off  
serves    serving    is served    served  
other    others    the other one    the others  

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