59 Use the verbs in brackets in the appropriate tense and

59 Use the verbs in brackets in the appropriate tense and voice:1 This patient (to operate on) yesterday. 2 Products of protein, fat, and carbohydrate digestion (to be absorbed) from the gastrointestinal tract by the liver in which they (to undergo) further chemical processes. 3 The liver (to destroy) toxic substances which usually (to be formed) in the intestinal tract as well as some poisons which (to enter) the body from without. 4 Jaundice (to be known) to be the disease which (to be due to) the presence of a large amount of bilirubin in the blood and tissues.