Khoanh tròn vào đáp án đúng nhất A, B, C hoặc D rồi điền đáp án đó vào chỗ trống của đoạn văn. In order to solve the problem of (21).. people have to be aware of it's causes some of which are quite obvious in every life. In many ..

Khoanh tròn vào đáp án đúng nhất A, B, C hoặc D rồi điền đáp án đó vào chỗ trống của đoạn văn.

In order to solve the problem of (21).. people have to be aware of it's causes, some of which are quite obvious in every life. In many cities people are forced to breathe in polluted air, commonly know as smog, which is caused by cars and (22)..... ... The pollution of lakes, rivers and seas (23)... to the death of the creatures that live in them. Finally, all over the world, especially in cities, we see huge amounts of rubbish in the streets, (24).......... we are responsible for. If the governments do not help (26) the problem, the people will face with the polluted environment