very hard crossword

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Across
  1. 3. base for life
  2. 6. their burgers are flat
  3. 8. they tell YOU what to do
  4. 11. when something is interesting
  5. 12. you do this with books
  6. 13. very very short sighted and stupid
  7. 15. you also do this with books
Down
  1. 1. when something is scary
  2. 2. people can smoke it or eat it
  3. 4. unwanted plant
  4. 5. required for life
  5. 7. exist for sleeping and belly rubs
  6. 9. kills but also warms
  7. 10. tasty and live in the sea
  8. 14. required for life