1. Cholesterol is present in large quantities in the nervous system, where ____ compound of myelin.

2. To break thick ice, an icebreaker boat moves fast enough to ride up on the ice, ____ under its weight.

3. Outbreaks of diseases in trees commonly occur _____ stressed because of drought or other environmental factors.

4. Isabel Bishop was one of many American artists ___ by the government during the Depression years on various federal art projects.

5. In art, the tendency of gouache colors to lighten on drying makes ___ a wide range of pearly or paste-like effects.

6. Mahalia Jackson, _____ combined powerfully vitality with great dignity, was one of the best known gospel singers in the United-States.

7. During the course of its growth, a frog undergoes a true metamorphosis _____ with fishlike larval stage.

8. The face of the Moon is changed by collisions with meteoroids, ____ new craters to appear.

9. The best known books of Ross Macdonald, _____ writer of detective novels, feature the character Lew Archer, a private detective.

10. Algonkian-speaking Native Americans greeted the Pilgrims _____ settled on the eastern shores of what is now New England.

11. The seating of musicians in an orchestra is arranged _____ to produce the desired blend of sounds from the various musical sections .

12. Long before children are able to speak or understand a language, _____ communicate through facial expressions and by making noises.

13. Martha Graham, _____ , has run her own dance company for half a century.

14. Sometimes__________to place physics and chemistry into separate categories.

15. The Cubists were concerned with how__________a given subject from different points of view simultaneously.