Lesson 8.

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Across
  1. 2. : a quicker route that leads from one place to another
  2. 4. : someone whose job is to study a subject carefully
  3. 9. : the activity of searching and finding out about something
  4. 11. the lowest part of something
  5. 12. : to notice something that is partly hidden or not clear
  6. 15. : to join or be joined with something else
  7. 16. : in the end, especially after a long time
Down
  1. 1. : to make a hole in something with a special piece of equipment
  2. 3. : continuing to exist or happen, especially for longer than is usual
  3. 5. : not solid or firm and therefore not strong, safe, or likely to last
  4. 6. : the front of the neck, or the space inside the neck down which food and air can go
  5. 7. : to become curved, or to make something become curved
  6. 8. : a person who is traveling in a vehicle but is not operating it
  7. 10. make a hole in something with a special piece of equipment
  8. 13. : a formal statement of the rules on which a subject of study is based
  9. 14. : to press something very hard so that it is broken or its shape is destroyed