Energy

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Across
  1. 3. energy by the sun
  2. 5. energy by wind
  3. 6. can recycle it into other form
  4. 9. to protect something
Down
  1. 1. always exist
  2. 2. the liquid can burn
  3. 4. to store something
  4. 7. to find out and use something
  5. 8. Quang Ninh province is famous for