选必三U2wordlist（2）

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Across
  1. 3. An important official task for a person or group
  2. 6. Lasting for a very long time or forever
  3. 8. An expensive non-essential thing for pleasure
  4. 11. /ˌreɪdiˈeɪʃn/
  5. 12. Time when one is not working or busy
  6. 13. All of space and everything in it
  7. 15. Able to be seen with the eyes
  8. 16. Path of an object moving around another in space
Down
  1. 1. Conditions in which something happens
  2. 2. Process of keeping something in good condition
  3. 4. The state of being away from a usual place
  4. 5. A living thing, especially an animal
  5. 7. a person traveling and working in a spacecraft
  6. 9. To judge the quality, usefulness or success of something
  7. 10. Force pulling objects toward a planet’s center
  8. 14. Extremely important for success or survival