The singular of nouns

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Across
  1. 3. mice
  2. 4. families
  3. 6. knives
  4. 8. children
  5. 10. sandwiches
  6. 13. tomatoes
  7. 14. ladies
  8. 15. boys
  9. 16. wives
Down
  1. 1. photos
  2. 2. shelves
  3. 5. men
  4. 7. friends
  5. 9. feet
  6. 10. sofas
  7. 11. windows
  8. 12. hobbies