The rule of three

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Across
  1. 5. Beginner
  2. 6. A group of vehicules
  3. 7. Point of control
  4. 9. Place to sit on in the living room
  5. 10. Type of building on a farm
  6. 14. Used to unlock things
  7. 15. The power to give orders
  8. 17. Fire caused by criminal
  9. 18. Made of wax, it can provide light
  10. 19. Cup
Down
  1. 1. Section of the road
  2. 2. Having judgement and experience
  3. 3. Pistol case
  4. 4. Unity used to calculate distance
  5. 8. 24 in one day
  6. 10. The name of the land behind a house
  7. 11. Expedition to keep watch over an area
  8. 12. Steps put in order
  9. 13. Doctor's assistant
  10. 16. Tool used to create light