It's Puzzling

1234567891011121314151617181920
Across
  1. 3. attribute
  2. 4. mistaken
  3. 8. acquire
  4. 9. assiant
  5. 10. periodical
  6. 12. infuse
  7. 13. countless
  8. 14. dangerous
  9. 18. problem
  10. 19. disregard
  11. 20. respiratory illness
Down
  1. 1. therapist
  2. 2. aware
  3. 5. warrior
  4. 6. cliff
  5. 7. condemn
  6. 11. in the air
  7. 15. I'm sorry
  8. 16. dismal
  9. 17. burning