Megacities

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Across
  1. 3. Completely full to the point of overflowing
  2. 5. A place of significant activity, danger, or violence
  3. 7. A place to get something to eat
  4. 13. A place to go for a walk
  5. 14. Cities have lots of these bright things at night
  6. 15. A place to go when you are ill
  7. 16. An underground form of transport
  8. 17. The state of being extremely dirty and unpleasant
  9. 18. Stealing goods from a shop
  10. 19. A place to learn history
  11. 21. A time when many people are driving on the road to get to work
Down
  1. 1. A place where people make things
  2. 2. Part of a street along which people can walk
  3. 4. A road where people drive fast
  4. 6. A time when traffic almost stops because there are too many cars on the road
  5. 8. A set of automatically operated coloured lights
  6. 9. Dirty air etc
  7. 10. A place where people park their cars
  8. 11. An intersection of two or more roads
  9. 12. A place to see a show
  10. 17. A squalid and overcrowded urban street or district inhabited by very poor people
  11. 20. A lot of people together