you often see a blue sky above our city?Is the air in our city fresh?Is the water in our river clean?The answers to these questions are all"No!" My grandma often tells many interesting stories (2)
her childhood.At that time,the sky was blue,the air was fresh and the water was clean.When my grandma and her friends played in the forest,they could(3)
the birds sing.When they (4)
in the river,they could see many fish.It was a happy time.(5)
today some animals and plants are now disappearing.The air and water are much(6)
than before.The Earth is in trouble. I want you to join us by (7)
protect our Earth because it is our home.We do not need to do big things.We can start out small.Do not throw (8)
rubbish onto the ground.Do not waste water.Use both sides of the paper (9)