Be the teacher

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Across
  1. 5. Not often
  2. 6. Feel sorrow
  3. 7. The state of being satisfied
  4. 9. Place or arrange in a straight line
  5. 11. Showing defiance
  6. 12. Officially register
  7. 15. The production of gas and radiation
  8. 16. The temporary prevention of something
  9. 18. Very old
  10. 19. Feeling or expressing bitterness
  11. 21. Physical or mental collapse
  12. 23. Intensly deep or bright
Down
  1. 1. A loud instrument
  2. 2. Reasoning
  3. 3. Not interested
  4. 4. Little, gone
  5. 7. An action that's morally or legally wrong
  6. 8. Events beyond your control
  7. 10. An evil fictional character
  8. 13. An event regarded as good or bad
  9. 14. Dismisses
  10. 17. Face something difficult patiently
  11. 20. A person who has escaped from a place
  12. 22. Needing immediate action