XII. Fill  in each blank with an appropriate preposition
1. In the furure, most people will travel _______ their flying cars.
2. Electric cars run ______ electricity supplied by rechargeable batteries.
3. Last week we went to Vung Tau _______ a ferry. It was wonderful.
4. We were stuck ____ a traffic jam and got to the meeting ten minutes late.
5. What will transport look like ____ 30 years?
6. Transportation is responsible ______ about 37% of global greenhouse gas emissions.
7. Is a soliwheel a practical means ______ transportation? 
8. Do you think travelling _____ bamboo copters will be popular in the future?
9. Are electric vehicles really sàe _________ the enviroment?
10. A bullet train can travel _______ a speed of 300 km/h