Formal vs Informal words 2

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Across
  1. 4. Evade
  2. 5. Construct
  3. 7. Intelligent
  4. 8. Ill
  5. 10. Challenge
  6. 11. Absent
  7. 12. Consult
  8. 16. Anticipate
  9. 17. Cease
  10. 18. Positive
Down
  1. 1. Amiable
  2. 2. Negative
  3. 3. Children
  4. 6. Courageous
  5. 7. Appear
  6. 9. Opportunity
  7. 13. Correct
  8. 14. Allow
  9. 15. Experiment
  10. 17. Demonstrate