There is no doubt that water plays an important role in our life. However, it's a pity that water is polluted day by day.IIt is caused by lot's of probems which do not seem to stop. In this essay, I'd like to mention about some factors that critically lead to the pollution of water. Firstly, water was polluted by sewage which residents dump into the rivers. Many beautiful rivers that we saw in the past now has black colour. Secondly, ...... Ghi tiếp giúp mình kiểu giống bài trên hình nhưng đừng ghi giống quá vì đây là bài tham khảo