Form the correct Plural

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Across
  1. 1. louse
  2. 5. tooth
  3. 7. lady
  4. 9. mouse
  5. 11. thief
  6. 14. ox
  7. 15. potato
  8. 17. sandwich
  9. 18. woman
  10. 19. goose
Down
  1. 2. child
  2. 3. man
  3. 4. photo
  4. 6. fish
  5. 8. sheep
  6. 10. car
  7. 11. tomato
  8. 12. wife
  9. 13. box
  10. 16. foot