Lesson 8.

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