Fill in the Blanks (Reading & Writing)

Modern recycling plants use magnetic separators and optical sensors to —sortsortingsortedsorts materials such as glass, plastic and metal before reprocessing. Contamination from food waste can —spoilspoiledspoilingspoilage entire batches, forcing workers to discard otherwise recoverable material. Efficient sorting therefore —dependsreliescountsinsists on both clean household separation and reliable machinery, and the —efficiencyefficientefficientlyefficacy of these systems is now a key measure of a plant's overall performance.