Đáp án của bạn đúng nha.

1. The Nhue River's water has turned black with the chemical discharged from factories.
2. The fascinating sky view offers us cultural and historical values.
3. People from "cancer villages" should go for medical examination.
4. Serious levels of water pollution poison aquatic life. 
5. Billboards should only be allowed to hang at roadside for a specific period of time.
6. At the higher levels, noise pollution may lead to physical and psychological damage.
7. The programme had a/an dramatic effect on the environment.
8. The volunteers made a/an heroic fight against pollution of the beach.

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