8. If you turn off the lights when goinhg out, you wil save electricity.

9. If we let our cars at home, the air will be fresh.

10. If we recycle the used paper, the tree will be preserve.

11. If we use bike, there won't be produce smoke. 

12. If you send old clothes for charity, people will take them away.

13. If they don't thown cans, the street will be clean.

14. If we plant trees, there will be more oxygen.

15. If we keep the water clean, the fish won't die.

16. If the river are clean, we can swim in.

17. If we take the shower, we will save the water.

18. If we use energy saving lights, we will save electricity.

19. If we put rubbish in the school yard, the student will garbage in.

20. If we use cloth bags, we will reduce rubbish.

~ Chúc bn hk tốt!~

~ Nếu đc thì cho mk trả lời hay nhất nha!~

8. If we turn off the lights before goinhg out, we will save electricity.

9. If we let our cars at home, the air will be fresh.

10. If we recycle the used paper, many trees will be preserve.

11. If we use bike,we won't produce smoke. 

12. If we send old clothes for charity, people will take them away.

13. If we don't throw cans, the streets will be clean.

14. If we plant trees, we will have more oxygen.

15. If we keep the water clean, the fish won't die.

16. If the rivers are clean, we can swim in.

17. If we take the shower, we will save the water.

18. If we use energy saving lights, we will save electricity.

19. If we put rubbish in the school yard, the student will garbage in.

20. If we use cloth bags, we will reduce rubbish.