Singular to Plural

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Across
  1. 3. SONG
  2. 5. PERSON
  3. 7. POTATO
  4. 8. BABY
  5. 11. LADY
  6. 13. LEAF
  7. 15. EYELASH
  8. 16. DOOR
  9. 17. VEHICLE
  10. 18. KEY
  11. 19. KNIFE
Down
  1. 1. BOOK
  2. 2. COMPUTER
  3. 4. GOOSE
  4. 6. WOLF
  5. 9. BUS
  6. 10. GLASS
  7. 12. TOOTH
  8. 14. PENCIL
  9. 16. DAY