Common spelling mistakes

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Across
  1. 5. complicated
  2. 7. colourful
  3. 11. disappointment
  4. 14. accomodation
  5. 15. accessible
  6. 17. conservation
  7. 19. excellent
  8. 20. fascinating
  9. 21. historical
Down
  1. 1. dangerous
  2. 2. enthusiasm
  3. 3. commitment
  4. 4. recommendation
  5. 6. happiness
  6. 8. opposite
  7. 9. entrance
  8. 10. zoology
  9. 12. sincerely
  10. 13. traditional
  11. 16. tremendous
  12. 18. organisation