1) We should plant more trees. a) b) 2) We shouldn't use public transportation. a) b) 3) We should keep the streets clean. a) b) 4) We shouldn't recycle waste materials. a) b) 5) Cut down trees. a) b) 6) We mustn't hunt the animals. a) b) 7) Litter the streets. a) b) 8) The balance of climates is not important for us. a) b) 9) We should sort out plastic, metal and glass bottles. a) b) 10) Use wind energy. a) b) 11) We shouldn't use renewable energies. a) b) 12) We must destroy rain forests. a) b) 13) We should buy eco-friendly products. a) b) 14) We should take efficient precauitons against global warming. a) b) 15) We should pollute our environment. a) b)

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