jetpack, a machine you wear on your back that helps you fly in the air, flying car, a car that can fly in the sky., fossil fuel, fuels, such as gas, coal, and oil., economical, using as little of something as possible., fast, moving or happening quickly., self-driving, used to refer to a vehicle that drives itself., wonderful, extremely good., spacious, large and with a lot of space., convenient, something is easy, useful, and saves time or effort., amphibious bus, a bus that can travel on land and water.

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