问题详情

Economy, one of the principles of success in the details of housekeeping, consists not alone 【C1】______ making advantageous use of fresh material, but in carefully【C2】______and utilizing the "left-over" fragments and bits of food. Few cooks can make【C3】______ perfect calculation respecting the needs of their families as to provide just enough and no more, and the waste of the 【C4】______ is in many homes fully equal 【C5】______ one half the cost of the meal. 【C6】______anything need ever be wasted. There are ways of utilizing almost every kind of cooked food【C7】______it will be quite as appetizing and nutritious as when first prepared. All left-over foods, as grains, vegetables, or others of a【C8】_____ character, should be removed to clean dishes. 【C9】______ this precaution is observed, the tiny bits about the 【C10】______of the dish, which become sour or moldy much sooner than the larger mass, are apt to 【C11】______the whole. They should also be set on ice or be kept in a cool, dry place【C12】______ needed. There are【C13】______other foods that can be combined into more delicious dishes than leftover bread if the bread is properly made from 【C14】______material and is well kept in a proper place. To【C15】______the perfect preservation of the fragments, the【C16】______ itself should receive good care. Broken pieces of bread may become【C17】______dry, and in that case, they are【C18】______to crackers for use in soups. In addition, small quantities of left-over grains can be utilized for preparing various kinds of desserts 【C19】______ the ingredients require previous cooking. They may also be used in the preparation of vegetable soups, many of which are even 【C20】______by the addition of a few spoonfuls of well-kept cooked oatmeal or rolled oats.

【C1】

A．of

B．with

C．by

D．in

请帮忙给出正确答案和分析，谢谢！