Travelling to the future

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Across
  1. 3. - A large piece of cloth on a boat used to catch the wind
  2. 6. - Vehicles like buses, cars, and trains that carry people or goods
  3. 7. - Cheap to run; helping you to save money
  4. 8. - Dangerous and bad-smelling smoke from cars or factories
  5. 10. - A small electric vehicle with only one wheel that you stand on
  6. 11. - A tiny electric vehicle that is the size of a laptop
  7. 14. - To make a journey from one place to another
  8. 17. - Easy, quick, and useful for your daily life
  9. 18. - To push down with your feet to make a bicycle move
  10. 19. - Using energy and light from the sun to run
  11. 22. - A sci-fi machine that moves people from one place to another instantly
  12. 23. - Doraemon's famous flying toy that you put on your head
Down
  1. 1. - The state of the environment being dirty and damaged by waste
  2. 2. - To make the air, water, or land dirty and unsafe
  3. 4. - Making you feel relaxed and nice when you sit in it
  4. 5. - A very fast train in Japan that looks like a bullet
  5. 9. - A modern car that runs on electricity instead of petrol
  6. 12. - The special job or natural purpose that something does
  7. 13. - A large round object in space that moves around the sun, like Earth
  8. 15. - The long metal tracks that trains run on
  9. 16. - A future transport system that carries passengers in tubes at super high speeds
  10. 20. - A function that allows a car or plane to drive by itself automatically
  11. 21. - A type of train that runs on tracks high above the ground