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Don't drop litter    . It's our duty to protect our environment.

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Don’t drop litter herE.    Would you mind not playing baseball here?    You have to get up early.    Would you mind not smoking in public?  
careful  carefully  careless  carelessly  
not to litter    don’t litter    not litter    no litter  
Good luck  Don’t worry  OK, I will  Sorry, I won’t  
to throw litter about    to throw litter into    throwing litter about    throwing litter into  
pause  refuse  reject  wait  
not drop   not to drop   don't drop   not dropping  

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