Plural add 's' or 'es'?

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Across
  1. 1. tomato
  2. 3. apple
  3. 4. dish
  4. 7. church
  5. 11. radio
  6. 13. elephant
  7. 15. cat
  8. 16. zoo
  9. 17. dog
  10. 18. fox
Down
  1. 2. sandwich
  2. 5. smile
  3. 6. brush
  4. 8. box
  5. 9. volcano
  6. 10. dress
  7. 12. kangaroo
  8. 14. table