___be done to stop the river from being polluted .A.what do

___be done to stop the river from being polluted .A.what do Little___done to prevent the air from being polluted. Wastewater from factories polluted the river为什么用polluted what's being done to the clavichord What should be done to stop young people from smoking? Only when the work is done ___be able to go back home.A you – Do you know why the river was polluted? what is being done to the clavichord?翻译哈 what can i do to stop the birds from breaking my window 怎么翻译 What should we do to stop prople from littering What can you do to stop colds from spreading What can you do to stop colds from spreading?