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.