13. Renewable energy will be used in the future.
14. This school is ours.
15. Much biogas will be used by people in the countryside in thefuture.
16. You didn't remember to tur off the TV last night, did you?
17. Why don't you go to work by bike?
18. Mr. Long used to live in the countryside when he was a child.
19. More trees will be planted along this street.
20. Pollution is the most serious probem, isn't it?
21. Linda used to live woth her parents.
22. Renewable energy will be used in the future.
23. How far is it from Vinh to Ha Noi city?
24. Solar energy will be used to protect the enviroment.
25. They return the motherland, don't they?
26. Will our roof be fixed tomorrow?
27. Flying cars will be showed to the public when they finish it.
28. Solar panels will be installed on the roof of our house next week.
29. Biogas will be being used for cooking and heating at this time next month.
