environment - Bikes are good for the ....... because they don't pollute the air., prevent - To ..... injury you should wear a helmet when riding a bicycle., chemicals - You should wear protective gloves when you touch ........ ., oil - ropa naftowa, cleaner - I need some ..... to clean that. , harm - Toxic waste and gases ..... the environment., release - Many factories ..... dangerous chemicals into the rivers and lakes., poisonous - A ..... snake bit him on the ankle., disappearance - The police are looking into the ...... of two people on the mountain.,

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