Заполните пропуски модальными глаголами can, may, must, should. 1. in man, obstruction of the common duct produce abdominal symptoms and increase of serum amylase. 2. an ulcer only on an epithelial or mucosal surface. 3. appendicitis be of different grades of intensity. 4. in an attack of acute appendicitis nb food be taken by mouth and no water except in very small sips. 5. there was general agreement that the patient's diet .. be rich in protein and carbohy drates, but poor in fat.

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