1. The beaver chews down trees to get food and material _____ its home.

2. A protagonist of a play is _____ in tragedy as the suffering main character.

3. Aerobic exercises create a _____ oxygen in the body without seriously disrupting normal body functions.

4. Plywood was originally manufactured from logs _____ for other purposes.

5. Though once quite large, _____ population of the bald eagle across North America has drastically declined in the past forty years.

6. The ancient Egyptian water clock required sophisticated calibration, since water dripped faster from its bowl when __and the pressure was greater.

7. Not until the late nineteenth and early twentieth centuries __as a unified science.

8. Made of hard wood, the boomerang is roughly Vshaped, with arms __skewed.

9. South American flamingos can survive in temperatures __above the freezing point.

10. Migraine headaches are more frequent among women __among men.

11. Historically, _____ chief material for making furniture has been wood, but metal and stone have also been used.

12. Ragtime is a kind of music _____ a strongly syncopated melody and a regularly accented accompaniment.

13. Economic goods may take the form _____ of material things or of services.

14. Although _____ some textile products, it imports many as well.

15. The significance of mythology within a culture is reflected in _____, the amount of time devoted to this activity, and the relevance of mythology to ceremonials.