Singular to plural

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Across
  1. 3. woman
  2. 5. house
  3. 6. cat
  4. 9. mouse
  5. 11. box
  6. 12. baby
  7. 15. river
  8. 16. potato
  9. 17. city
  10. 18. foot
Down
  1. 1. man
  2. 2. dog
  3. 4. tomato
  4. 7. sheep
  5. 8. fish
  6. 10. child
  7. 13. bus
  8. 14. foot