unit 8 words

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Across
  1. 5. the aim of sth.
  2. 6. cause to come to the ground
  3. 9. give expression to
  4. 10. something of value
  5. 11. the place where sth. should be
  6. 12. a person who studies history
  7. 14. to get or be given sth.
  8. 16. the power of being active
  9. 18. ready to fall asleep
Down
  1. 1. something that is not known
  2. 2. relating to medicine
  3. 3. to stop sth. from happening
  4. 4. a person who was in the past
  5. 7. be present at
  6. 8. a workplace for scientific research
  7. 13. someone who hates another
  8. 15. success in defending an enemy
  9. 17. a erson who leads others