opposites/ antonyms

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Across
  1. 4. What is the most common type of food in US?
  2. 5. The word describing that we rarely do.
  3. 7. "The organization was removed by its founders."
  4. 8. The situation when you sleep well.
  5. 9. "The singer made music separately from his producer".
  6. 10. "My brother took such a ... course when he was at school that took him six years to complete".
Down
  1. 1. Something not existing or not happening at the same time.
  2. 2. A quick look at something.
  3. 3. The feeling of fulfillment and happiness.
  4. 6. The opposite adjective describing someone or something unknown.