Many of them are throwing junk foods in class dusbins
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First of all , i will warn my friends not to throw the eatables here and there as it will make the classroom dirty and unhygienic.If they understand it , they will not do it again. And they will teach other students not to do it and then those students will stop others.. In this way , ultimately everyone will stop throwing eatables.But , this peace way of soilving the problem within classmates without the involvement of teachers is a rare case.IF THE STUDENTS donot follow my or my friends advice , i will go and complain it to my teacher and ask her to take strict actions or give strict punishments if they dont even listen to teachers warning.
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thank you so much 
1)What other problem do you think this could cause.