The Plural Puzzle

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Across
  1. 6. ox
  2. 7. analysis
  3. 8. leaf
  4. 10. index
  5. 11. valley
  6. 13. witch
  7. 16. fly
  8. 18. rider
  9. 21. monkey
  10. 22. wife
  11. 24. glass
  12. 25. sheep
  13. 26. church
Down
  1. 1. diagnosis
  2. 2. aircraft
  3. 3. potato
  4. 4. cherry
  5. 5. comedy
  6. 9. shelf
  7. 12. chief
  8. 14. crisis
  9. 15. quiz
  10. 17. series
  11. 19. radio
  12. 20. solo
  13. 23. tooth