3. Man learned to cook by accident.
4. In the Middle Ages even the palaces of the wealthy were cold because wood was much too expensive.
5. In striking a match, friction raises the phosphorus compound in the tip to the kindling temperature.
6. Red phosphorus is the only means of making phosphorus safe.
7. Fire has played an important role in the progress of civilization.
8. The small hole in the top of the American Indian tent was used as a______.
9. Employees in match factories used to suffer from a disease______the jaw bones.
10. Air is needed to start a fire because it______.
I. N 2. Y 3. Y 4. N 5. NG 6. N 7. Y
8. smokestack 9. which decayed 10. supports combustion
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