relative clauses puzzle

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Across
  1. 4. a day when you exchange gifts with people
  2. 6. animal which is a person's best friend
  3. 7. a device that you use to call people
  4. 9. a fictional character who saves people
Down
  1. 1. a thing that we use to look for information
  2. 2. a place where you go to learn things
  3. 3. someone who studies at a school or university
  4. 5. animal that is so wonderful it hurts
  5. 8. potter a book whose title is related to magic