1 is a renewable source a. coal b. oil c. wind d.gas 2. you can wear a . on your back to fly anywhere easily in the future a. jet pack b. fying car c. teleporter d. high-speed bicycle 3/ in the future most people will travel . flying train a. in b. by c. at d. on 4. do you think we driverless car in the future a. use b. to use c. will use d. have used 5. .. is a single-wheel bike a. monowheel b. hover scooter c. segway d. teleporter 6. nuclear energy can provide electricity for the world needs, but it is a. cheap b. dangerous c. unlimited d. safe