Crossword Puzzle

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Across
  1. 4. A useful or valuable possession or quality of a country, organization, or person
  2. 6. To treat things that have already been used so that they can be used again
  3. 8. Being the only existing one of its type or, more generally, unusual or special in some way
  4. 9. A thing that you can choose to do or have out of two or more possibilities
Down
  1. 1. mainly
  2. 2. To allow a substance to flow out from somewhere
  3. 3. An unnecessary or wrong use of money, substances, time, energy
  4. 5. Relating to forms of energy that are produced using the sun, wind
  5. 7. In a way that relates to the environment