7-12 units

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