Hãy giải giúp em với

BÀI TẬP TIẾNG ANH LỚP 9 HK A pollute B. cleared B. but & We couldn't go on a picnic as planned 9. I think people should use tree leaves for A wrapping B. rolling A garbage bins 12. Plastic bags are very hard 10. You should clear A over B, out 11. In order to keep the school ground tidy ...