welcome to high scool

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Across
  1. 5. Opinion given to someone on what they should do
  2. 7. a chance, or prospect success
  3. 9. something that comes from nature
  4. 10. to cause something to increase
  5. 11. Cut into pieces
  6. 13. Class in which we store objects of the same nature
  7. 14. mathematical operations
  8. 16. useless waste
  9. 18. a person enrolled in a school
  10. 19. to carry out an action
Down
  1. 1. antonyn of private
  2. 2. the act of collecting money, especially for a charity
  3. 3. the period that starts at about twelve o'clock
  4. 4. envelop a surface or an object
  5. 6. Musical session
  6. 8. a tool for making music
  7. 11. a member of the same class in a school
  8. 12. make a choice
  9. 15. Set of contours
  10. 17. comprehend