Inter-

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Across
  1. 3. breaks between parts of a play
  2. 5. worldwide computer system
  3. 6. person who translates
  4. 7. social activities among people
  5. 9. between the nations of the world
Down
  1. 1. getting between two people's problems
  2. 2. to remark when two people are having problems
  3. 4. breaking into a person's conversation
  4. 6. playing or activity among people
  5. 8. road between two states