easy

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Across
  1. 3. difficult
  2. 7. original
  3. 8. become bigger
  4. 9. logo
  5. 11. substitution
  6. 12. inhabitant
  7. 14. illustrate
  8. 15. the vertex
Down
  1. 1. come across
  2. 2. the last day
  3. 4. coach or tutor
  4. 5. organize
  5. 6. constant
  6. 10. abundant
  7. 13. put off