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Cities need to put efforts to deal with pollution and clear the air. Chinese cities will nee...

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put out    put away    put on    put up  
additional  efficient  excessive  adequate  
saved  earned  made  offered  
put down  put up  put on  put off  
put on   put away   put down   put off  
limit    lack    need    demand  
might put    should have put    need put    may have put  
In place of    In search of    In time of    In praise of  
A.bit more effort; solved    Doubling your efforts; settled    If you put more efforts into it; worked out    As long as you build up confidence; figured out  
made  saved   earned  offered  
them    those    it    that  
put down    put away    put in    put through  
in turn    in time    in vain    in need  
additional  efficient  excessive  adequate  
but that    but for    however that    no matter how  
saved    earned  made  offered  
put forward    put down    put away    put off  
made    tried    had    put  
put away    put off    put on    put up  

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