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Across
  1. 1. to make a sound by hitting a surface
  2. 3. not very straight
  3. 4. you do this to a door when you exit the school
  4. 6. a plate full of something
  5. 8. not very soft
  6. 9. extremely tasty
  7. 12. a building
  8. 13. the way you feel when you haven't done your homework. Feel sorry.
  9. 16. full of poison
  10. 17. very near
  11. 18. happy and joyful
  12. 20. you can do it via VK or Facebook etc.
  13. 21. a sharp pointy metal stick you kill people with
Down
  1. 2. it burns to make light
  2. 4. you do this to a door when you enter the school
  3. 5. a piece of cloth you cover table with
  4. 7. a flow of photons (and also a wave)
  5. 10. to fight
  6. 11. a pair of people
  7. 14. add "Super" and here you have the most popular sporting event in the US
  8. 15. a place where you live and where you belong to
  9. 19. make a pair. Again.