Chemistry is the study of the behavior and composition of matter. All foods aremade up of chemical substance which undergoes chemical changes when cooking　　    1．______in an oven or digested within the body. The cooking of meat and vegetables induce　2．______chemical changes, making it more delicious; similarly the leavening action of　　　3．______baking powder is a straightforward chemical change, as is the conversion ofstarch into sweet sugars by digestion.Cookery is a science requiring a knowledge of chemistry.　　　　　　　　　　　     4．______This is evident from the variety of cooking products and food additives availableas cooking oils, fats, colorings, sweeteners, tenderizers, flavorings, screamingagents, preservatives, etc. Each is carefully prepared before painstaking　　　　　5．______research.　　It is therefore essential for trained cookers to understand　　　　　　　　　　6．______chemical science in order to appreciate the chemistry nature of foods　　　　　　　7．______and the changes achieving on cooking. Homeworkers should also　　　　　　　　      8．______know cleansing agents and textiles used in the home and how the latter　　　　　　 9．______responds to the effects of heat, light, water, and chemical cleansing agents.　　　10．______