II. Choose the correct answer. 6. Driverless cars have already , and they look so cool. A. gone B. travelled C. exist D. existed 7. If I have a jet pack. I will use to fly anywhere easily. A. my B. mine C. his D. their 8. I think teleportation is only . A. imagine B. imaginary C. imaginable D. imagining 9. Do we need much to park that kind of vehicles? A. land B. ground C. soil D. space 10. Do you think it will be (an) , green way to travel? A. convenient B. inconvenience C. polluting D. polluted 11. I think in the future cities will be more crowded and the traffic will get . A. good B. well C. worse D. wors 12. Which is the best of transport for the future? A. mean B. means C. traffic D. ways 13. Sidewalks are to moving walkways in airports. A. familiar B. similar C. different D. same 14. We are looking for cheap, clean, sources of energy. A. polluting B. harmful C. expensive D. effective 15. We should try to reduce energy as much as possible. A. production B. producers C. consumption D. consumers 16. Solar energy is and it can be replaced easily. A. new B. renew C. renewable D. non-renewable 17. For many people living in rural areas, biogas is a cheap energy available. A. method B. production C. supply D. consumption 18. Sources of energy will be used more for our future. A. effective B. efficient C. effectively D. efficiently 19. regular light bulbs with low energy light bulbs, which use less energy. A. Turn B. Replace C. Place D. Put 20. Don’t forget to the lights when leaving a room or going to bed. A. turn B. turn on C. turn off D. turn out 21. The use of biogas for cooking in the countryside. A. will increase B. will be increasing C. will be increased D. will have 22. The digital camera belongs to Nick. That camera is . A. him B. he C. his D. one 23. Is this schoolbag ? A. you B. your C. yours D. them 24. There are more problems in the slums than in the areas. A. wealth B. richness C. wealthy D. country 25. is quite popular in an overcrowded city where you can see people sleeping in a park or under a bridge. A. Homeless B. The homeless C. Homelessly D. Homelessness