1) To reduce air pollution, people ___ use public transportation. a) Shouldn't b) Must c) Mustn't d) Should 2) People ___ throw trash into rivers. a) Shouldn't b) Must c) Mustn't d) Should 3) To protect forests, we ___ plant more trees. a) Shouldn't b) Must c) Mustn't d) Should 4) Factories ___ treat their waste before releasing it into water. a) Shouldn't b) Must c) Mustn't d) Should 5) Families ___ recycle plastic at home. a) Shouldn't b) Must c) Mustn't d) Should 6) People ___ burn trash because it increases air pollution. a) Shouldn't b) Must c) Mustn't d) Should 7) To reduce noise pollution, we ___ keep the volume low at night. a) Shouldn't b) Must c) Mustn't d) Should 8) Children ___ learn how to protect the environment. a) Shouldn't b) Must c) Mustn't d) Should 9) Factories ___ dump chemicals into the ocean. a) Shouldn't b) Must c) Mustn't d) Should 10) People ___ bring reusable bags when they go shopping. a) Shouldn't b) Must c) Mustn't d) Should

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