advanced students never give up

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Across
  1. 2. stops
  2. 4. book collection
  3. 6. the founder of this school
  4. 8. cannot be defended
  5. 11. sudden start, epidemic
  6. 13. Russian goldsmith, made Easter eggs
  7. 15. The firm kept its troubles in secret,I mean,under...
  8. 16. affluence
  9. 18. because of, as a result of
  10. 19. long-eared mammal, mad in March
  11. 20. one of two sister tennis stars
  12. 21. coastal area
Down
  1. 1. Italian sausage
  2. 3. natural waterway
  3. 5. sailing boat
  4. 7. smashing, crashing, vandalism
  5. 9. female relative
  6. 10. a long step when walking or running
  7. 12. increase growth
  8. 14. this groupmate lives in Italy
  9. 17. sea journey