We should use public transportation., We should turn off the tap., We shouldn’t cut down trees., We shouldn’t pollute the air., , We shouldn’t cut down trees., We shouldn’t throw rubbish around., We shouldn’t pollute the air., We shouldn’t harm animals., , We should turn off the lights., We shouldn’t wash dishes by hand., We shouldn’t harm animals., We shouldn’t throw rubbish around., , We should turn off the lights., We shouldn’t use plastic bags., We shouldn’t cut down trees., We should turn off the tap., , We should use public transportation., We shouldn’t pollute the air., We shouldn’t use plastic bags., We shouldn’t harm animals., , We shouldn’t cut down trees., We should use public transportation., We should turn off the tap., We shouldn’t harm animals., , We shouldn’t pollute the air., We shouldn’t use plastic bags., We should turn off the tap., We should turn off the lights., , We should turn off the lights., We shouldn’t cut down trees., We shouldn’t use plastic bags., We should use public transportation., , We shouldn't cut down trees., We shouldn't pollute the air., We shouldn't harm animals., We should use public transportation., , We should plant new trees., We shouldn't pollute the air., We should recycle old paper., We shouldn’t harm animals..

6.9.3

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