7-12 units

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Across
  1. 4. a change
  2. 7. to improve (Ex.: the rules of the game were....)
  3. 10. trial (trial test)
  4. 11. prevalent, essential
  5. 12. unhappy, disappointed, having no hope
  6. 13. jealous
  7. 15. profitable
  8. 18. ability to write and speak correctly
  9. 20. undoubtedly
Down
  1. 1. =it is likely that(noun)
  2. 2. very embarrassed
  3. 3. old-fashioned
  4. 4. not friendly or unwilling to take part in things
  5. 5. very beautiful, stunning
  6. 6. a number of things following one after other
  7. 8. to drop small pieces over dish
  8. 9. to say that sth is certainly true
  9. 14. precious things
  10. 16. strong, firm (about material)
  11. 17. taxes
  12. 19. difficulty, deprivation