Change the noun into a plural

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Across
  1. 5. teacher
  2. 7. park
  3. 9. leader
  4. 12. playground
  5. 13. issues
  6. 14. project
  7. 16. student
  8. 17. year
Down
  1. 1. recipe
  2. 2. sidewalk
  3. 3. school
  4. 4. decision
  5. 6. proposal
  6. 8. vegetables
  7. 10. result
  8. 11. parents
  9. 15. idea