Unbroken puzzle

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Across
  1. 2. (p.8): by way of habit, customarily
  2. 4. move through water like a porpoise; repeatedly surface and submerge
  3. 8. absolutely necessary
  4. 12. enjoyable recollection of past events
  5. 13. (p. 31): skillful at or given to pilfering/stealing
  6. 17. very hot; burning
  7. 19. West inflatable life vest issued to servicemen in WW2
  8. 21. savagely fierce, cruel, or violent
  9. 25. substances that initializes insensitivity to pain
  10. 26. causing anxiety or concern
  11. 27. act of varying rotors and propellers to reduce air or water resistance
  12. 28. pitifully sad and abandoned or lonely
Down
  1. 1. requiring considerable time and effort
  2. 3. (p.19): physical or mental effort
  3. 5. (p. 31): throw or drop from an aircraft or ship
  4. 6. a dangerous, difficult, or unfortunate event
  5. 7. (p. 10): strike repeatedly with the fists
  6. 9. scented ointment or oil applied to the hair
  7. 10. (p.16): excessive enthusiasm or desire: obsession
  8. 11. (p. 24): inspiring respect; having high status
  9. 14. main body of an aircraft
  10. 15. cause continual trouble or distress
  11. 16. keep someone or something afloat
  12. 18. making twisting or squirming motions with the body
  13. 20. expressed clearly - easy to understand
  14. 22. a ghost
  15. 23. a pattern of spirals or concentric circles
  16. 24. divide up and share