Cities

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Across
  1. 2. An underground train system.
  2. 3. Good and comfortable enough to live in.
  3. 5. Not dangerous.
  4. 7. A place in the centre of a city.
Down
  1. 1. Easy and useful.
  2. 4. Very full of people.
  3. 6. Busy, active and full of people.