Why Do People Laugh?

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Across
  1. 3. movements or actions
  2. 6. cure an illness
  3. 8. difficult
  4. 10. in a normal way
  5. 12. the same number or size
Down
  1. 1. form a link or relationship with someone else
  2. 2. act as someone else
  3. 4. do experiments
  4. 5. healthy
  5. 7. have many activities
  6. 9. feel calm less worried
  7. 11. show your happiness