Transport

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Across
  1. 5. A fast train that travels under the ground (Metro).
  2. 7. To make something die.
  3. 9. Dirty air or water that is bad for the planet.
  4. 10. Too many cars on the road that cannot move.
Down
  1. 1. To move from one place to another in the city.
  2. 2. A line of people waiting for their turn.
  3. 3. A very, very long time.
  4. 4. Another word for "fast." The opposite of slow.
  5. 6. The busy time when everyone goes to work or school.
  6. 8. Something that costs very little money.