unit 5 crossword puzzle

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Across
  1. 4. urgent and severe
  2. 5. pressure or tension
  3. 6. having existed for a long time
  4. 8. relating to the heart and blood vessels
  5. 9. make stronger
Down
  1. 1. great destruction or damage
  2. 2. put or send out
  3. 3. a system with a way of doing sth
  4. 5. noticeable, eye-catching
  5. 7. substance produced in an organism