knowledge

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Across
  1. 2. - area of study like Maths
  2. 4. - not easy
  3. 6. - place to borrow books
  4. 9. - the day after today
Down
  1. 1. - kind and pleasant
  2. 3. - opposite of after
  3. 4. - happening at the same time
  4. 5. - person who teaches in school
  5. 7. - a reply to a question
  6. 8. - work students do at home