Choose the right order to make up a story.
1. They made gas from wood and plants instead.
2. The cars didn`t go fast, but it was better than nothing.
3. There is not enough petrol on the world for everybody now.
4. In the second World War some people didn`t use petrol in their cars.
5. But we cannot cut down all our trees to make gas.
6. They put it in big bags on top of their cars.