Chemistry plays an important part in our life. The (1) ______ of a clock, (1) ______. the clothes we wear, and our leather shoes are all made (2) ______. (2) ______. the water we drink is chemically purified. The glass and (3) ______ of the mirror, (3) ______. the manufacturing of light bulbs, the paint and plaster on our walls require chemistry. The cooking, digestion and assimilation of the food are all chemical (4) ______ (4) ______. The construction of an automobile may require many kinds of chemically made (5) ______ (5) ______. Chemistry and its (6) ______ have helped us to live longer. (6) ______. The science of medicine also (7) ______ heavily upon chemistry. (7) ______. And with (8) ______ and antiseptics, surgery is no longer crude and limited. (8) ______. Our increasing knowledge of the chemical (9) ______ that take place in the human body results in great strides in modern medicine. (9) ______. Fortunately, most of us do not need a profound knowledge of chemistry, but some understanding of chemistry should be a part of the (10) ______ of every educated person. (10) ______.