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9. It’s good if children do something to save energy at home.

Children should

10. They will probably buy devices that run on electricity.

They might

11. Hydropower is larger than any other renewable energy source for electricity.

Hydropower is

12. It is necessary for us to reduce the fossil fuel consumption to save the environment.

We must

13. In the past people didn’t use as much renewable energy as they do now.

Now people use

14. My brother is interested in riding an electric motorbike to school.

My brother likes

15. Although Eric is a child, he knows how to use water efficiently.

Eric is

16. There is a diverse energy fuel resource of various types in Viet Nam.

Viet Nam

17. They intend to buy a new motorbike.

They will

18. Julia is one of my friends.

Julia is a

19. Train travel might be the best transport method.

Train travel will probably

20. This is her new car.

This new car

21. Which is your notebook?

Which notebook ?

22. My bicycle isn't as expensive as yours.

Your bicycle

23. Find a gas station or we will run out of fuel soon.

If we don't

24. Who does the motorbike belong to?

Whose