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.