Missing Backpack

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Across
  1. 2. at the back of something
  2. 4. to look for something carefully
  3. 7. happy because a problem is solved
  4. 8. a long passage in a building
  5. 9. a long seat
  6. 10. not there / lost
  7. 11. a place with historical or interesting objects
  8. 13. quickly and unexpectedly
  9. 16. a bag you carry on your back
Down
  1. 1. speak very quietly
  2. 3. trip a school trip to learn something outside school
  3. 5. where two walls meet
  4. 6. to give something back
  5. 7. to understand something
  6. 11. a drawing that shows where places are
  7. 12. a sculpture of a person or animal
  8. 14. to see something important
  9. 15. a person who protects a place