It's all Greek to me

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Across
  1. 4. we can watch films there
  2. 6. when I have a fever I use a
  3. 7. Superman is a
  4. 8. we listen to it to relax
Down
  1. 1. we draw on it
  2. 2. whales live there
  3. 3. unicorn is a creature of our
  4. 5. someone who does athletics