II ) 
1. We will use less electricity in the future.
Less electricity will be used in the future.
2. The students in my school will use public transport when travelling long distances.
Public transport will be used in my school by the students when travelling long distances.
3. I will turn off the lights when leaving a room or going to bed.
The lights will be turned off when leaving a room or going to bed.
4. Wind power will offer a great deal of energy next century.
A great deal of energy will be offered by wind power next century.
5. We will use sources of energy more effectively for our future.
Sources of energy will be used more effectively for our future.