Sacha's challenge

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Across
  1. 3. things that are not real in the ordinary world
  2. 5. something that works on its own
  3. 6. fit together closely and securely
  4. 10. put something completely under water
  5. 11. what something is made of
Down
  1. 1. not supporting your country
  2. 2. something that helps you feel better when you are sick
  3. 4. medicines that help fight bacterial infections
  4. 6. get involved with something that isn't your business
  5. 7. a place where you can find lots of books
  6. 8. how long something is from one end to the other
  7. 9. an underground railway system