6. The white cat is Helen’s, and the black cat is . A. my B. I C. mine D. of mine 7. We try to make the future green by using vehicles or kinds of energy that are A. environmentally friendly B. environment friendly C. environmentally friendship D. environmental friendly 8. This is Linda’s hat, and those shoes are , too. A. her B. hers C. our D. their 9. It will be to ride a jet pack in bad weather because it doesn’t have a roof. A. enjoyable B. pleasant C. unpleasant D. comfortable 10. A sky safety system can help cars to _______ traffic jams and crashes. A. prevent B. have C. use D. take 11. People won’t use flying cars the year 2050. A. before B. after C. during D. until 12. Is the most serious problem? A. pollution B. polluted C. pollute D. pollutant 13. We believe that urban transport pods can travel around 30kph. A. with B. at G. in D. on 14. Do you think the price will increase next month? A. fossil fuels B. gases C. fuel D. natural gases 15. We will use more energy in the future. A. solar B. sunny C. sun D. sunlight 16. A jet pack doesn’t a lot of space. A. have B. bring C. take D. occur 17. Which of transport do you think will be used in the future? A. mean B. meaning C. meanings D. means 18. We are looking for types of vehicles that help us to avoid . A. traffic B. traffic jams C. rush hours D. walking