1) we ...... use energy saving bulbs a) must b) mustn't 2) we ...... save water a) should b) shouldn't 3) we ...... use eco- friendly products a) shouldn' t b) should 4) we ....... hunt animals a) must b) mustn't 5) you ..... reuse paper a) must b) mustn't 6) we ..... destroy forests a) should b) shouldn't 7) we ...... use public transportation a) should b) shouldn't 8) we ...... use less electricity a) must b) mustn't 9) people ...... use fossil fuels a) must b) mustn't 10) We ..... save animals a) should b) shouldn't

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