| 1 | Some of the waste material can be reworked for reuse. | |
| 2 | They produced ethylchloride by reacting chloride with waste. | |
| 3 | The river has been polluted by waste products from the factory. | |
| 4 | Biomass may also include biodegradable wastes that can be burnt as fuel. | |
| 5 | Over the years, the waste began to bubble up into backyards and cellars. |
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