Cars and factories produce _______________ that are bad to breathe., factory, pollution, toxic fumes, environment, Trees give us _______________ to breathe, recycle, oxygen, harmful, cans, We should _______________ paper, plastic, and glass., recycle, oxygen, harmful, cans, ___________ damages trees and buildings., harmful, species, newspaper, acid rain, Air _______________ is a big problem in big cities, species, pollution, desert, camel, We must protect the _______________ for animals and people., government, environment, recycle, desert, You can recycle _______________ and bottles., camel, cans, pollution, oxygen, Camels live in the _______________, pollution, desert, environment, recycle

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