XII:
1) Less electricity will be used by our in the future.
2) Public transport will be used by the students in my school when travelling long distances.
3) The lights will be turned off (by me) when leaving a room or going to bed.
4) A great deal of energy will be offered by the wind power next century.
5) Sources of energy will be used more effectively (by our) for our future.
6) The use of biogas will be increased for cooking.
7) A hydropower station in the North of the country will be built by them next decade.
8) The problem of energy shortage will be solved the problem by using solar energy.
XIII:
1. The film wasn't interesting, was it?
2. We used to play these games when we were small.
3. How did you pay for the first class ticket?
4. How far is it from the village to the beach?
5. Tam's essay wasn't satisfying the teacher.
6. You should start to run and see if that helps you to lose weight.
7. Although it's very noisy in the city, we enjoy living there.
8. The guide doesn't speak slowly enough for me to understand.
9. Our teacher drives carefully.
10. Mr Tam used to work by car some years ago, but now he cycles.
