英语短文改错.注意：文中有 10 处错误,每句中最多有两处,错误涉及一个单词的增加、删除、或修改
Nowadays paper still come from trees .Unfortunate,we use a lot of paper every day.We must not waste paper,and there will not be any tree leaving on earth .No tree means no paper .We need 17 ttees make a ton of paper .We must start using less paper now because it takes about 100 years of a tree to grow .What can we save paper Firstly,we can use both the sides of every sheet of paper .We can use plates instead of paper one .We can also use handkerchiefs instead of paper .Besides,we can use less paper shopping bags and reuse them lates as well .