Expression idiomatiques

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Across
  1. 2. at first sight
  2. 4. it is about
  3. 6. to know something
  4. 8. to use
  5. 9. to be back
Down
  1. 1. outside
  2. 2. to have luck
  3. 3. please/kindly do so
  4. 5. to take a class
  5. 7. suddently