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