1.People believe that the ____polluted__water has brought cancer to the local residents. (pollute)
2.Noise is considered as__environmental___ pollution. (environment)
3.A number of cleaning products contain__harmful__ chemicals. (harm)
4.Water samples collected at these villages were seriously__contaminated__with bacteria.(contaminate)
5.Contaminants are usually___poison_ to aquatic plants. (poison)