1. Beneath the streets of a modern city ________ of walls, columns, cables, pipes and the tunnels required to satisfy the needs of its inhabitants.

2. The early years of the United States government were characterized by a debate concerning _______ or individual states should have more power.

3. Now considered an art form, quilt-making originated as a means of fashioning bed covers from bits of fabric that otherwise _____ .

4. In 1938 Pearl S. Buck became the first American woman ________ the Nobel Prize for Literature.

5. The growth of psychobiology owes ________ to major conceptual advances in the way people think about the brain.

6. The United States Department of the interior designated the Brooklyn bridge_____ in 1964.

7. Columbia University’s School of Public Health is_____ a handful of schools of public health in the United States.

8. The twentieth century has been a period of enormous growth in mathematical research and in the number of mathematicians and fields_____ them.

9. Living organisms contain more water_____ substance.

10. Medical research at the cellular level,_____ research on the immune system, has been made possible through twentieth-century advances in techniques of genetic research.

11. Giant corporations_____ to dominate the United States economy in the late nineteenth century, grew steadily larger during the 1920%.

12. Manipulation of the spinal column, massage, and dietary adjustments_____ used in chiropractic therapy.

13. Much of northern Canada lies within the Arctic Circle, and_____ ice or the sparse vegetation known as tundra.

14. The Buffalo River in Arkansas was designated_____ in 1972.

15. When_____ from milk, the remainder is called skim milk.