What's this?

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Across
  1. 2. Your teachers use this to mark books.
  2. 3. case You use this to keep your stationery.
  3. 4. You can use it to draw lines.
  4. 7. You can carry your books with it.
  5. 9. You can write your secret in it.
Down
  1. 1. You use this to write.
  2. 5. You use this to erase.
  3. 6. You can put your things on it.
  4. 8. You can read this.