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________such heavy pollution already the river is hard to be cleaned up

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put up    put off    put up with    put away  
At one time  At a time  At no time  At all times  
water pollution  air pollution  noise pollution  rubbish  
Suffered    suffer    Having suffered    To suffer  
Having suffered    Suffering    Suffered    Suffers  
predicting    predicted    being predicted    to predict  
Me too    Never mind    Of course    Not yet
  
put up    put up with    put off    put away  
Housing shortage.  Waste disposal.  Heavy traffic.  Pollution.  
both/and  whether/or  neitheror  because/so  
Having suffered    Suffering    To suffer    Suffered  
Having suffered    Suffering    To suffer    Suffered  
A. are being closed    were being closed    was being closed    is being closed  
Having suffered    Suffering    To suffer    Suffered  

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