Things in school

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Across
  1. 4. You colour with it
  2. 5. You write with it
  3. 8. You can have your books on it
  4. 9. you erase with it
Down
  1. 1. You read in it
  2. 2. You write with it on the board
  3. 3. a kind of devise
  4. 4. you can see the time on it
  5. 6. you sit on it
  6. 7. you write with chalk on it