Ai giúp mik với mik cần gấp lắm 1. This river will soon become ________________ if the people here keep dumping waste into it. (POLLUTION) 2. Scientists say that exhaust fumes are______________ our city. (POISON) 3. Are all types of pollutions __________________ to the health of humans and animals. (HARM) 4. The _________________ of lakes, rivers, oceans or underwater causes water pollution. (CONTAMINATE)