People ....................... walk or cycle to reduce air pollution., must, mustn't, We ....................... waste electricity or water., must, mustn't, We ....................... recycle to reduce the amount of rubbish., must, mustn't, People....................... take necessary precautions to save energy sources., must, mustn't, We....................... use eco-friendly products to save our planet., must, mustn't, People ....................... cut down trees. They produce oxygen for us., must, mustn't, We ....................... use energy-saving bulbs, must, mustn't, Factories ....................... pour their waste into rivers or seas., must, mustn't

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