Waste paper shouldn’t _____ everywhere. It’s our duty to kee

Waste paper shouldn‘t everywhere.It‘s our duty to keep our c Don't throw waste paper everywhere.It's our duty to keep our Waste paper shouldn't ____ enerywhere.It's our duty to keep Waste paper should be throun every were,It's our duty to kee waste paper shouldn't be t( ) everywhere.it It's our duty to ____ _____ _______（保护环境） Don't t____the waste paper everywhere. Don't t_____ here and there.It's our duty to keep our school It's our duty to help b___ people because they aren't able t It's our duty to help (b ) people because they aren't able t It's our duty to make our city much_____ it's our duty to protect our environment/是什么意思请问