Irregular plural of nouns

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Across
  1. 3. Feet
  2. 6. Chairmen
  3. 7. Criteria
  4. 8. Oxen
  5. 10. Curricula
  6. 11. Teeth
  7. 12. Lives
  8. 14. Analyses
  9. 16. Millennia
  10. 18. Mice
  11. 19. Shelves
  12. 21. Halves
Down
  1. 1. Lice
  2. 2. Leaves
  3. 4. Phenomena
  4. 5. Wives
  5. 9. Geese
  6. 10. Children
  7. 13. Knives
  8. 15. People
  9. 17. Wolves
  10. 20. Larvae