Transform these verbs into nouns

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Across
  1. 2. discover
  2. 6. decide
  3. 7. response
  4. 9. arrive
  5. 10. perform
  6. 11. educate
  7. 12. agree
  8. 13. conclude
  9. 16. explain
  10. 17. develop
  11. 19. improve
  12. 20. complain
Down
  1. 1. advertise
  2. 3. discuss
  3. 4. achieve
  4. 5. encourage
  5. 8. invite
  6. 14. success
  7. 15. choose
  8. 18. excite