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We live in a big city,....idn't we?

People don't sort out rubbish,......

Most cities have created landfills, .....

I'm ready to help the environment,.....

My older sister's working in the garden today

Last lesson the teacher told us about the environmental protection,....

Marine animals won't survive if we throw away a lot of plastic, ......

Your classmates didn't sort out rubbish,........

There is a lot of litter everywhere in our country,....

My friend's just taken her old paper to the recycling center,....

Our parents didn't use to use so much plastic,.....

We can't live in a big landfill,......