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.

1 This patient was operated on yesterday.
2 Products of protein, fat, and carbohydrate digestion are absorbed from the astrointestinal tract by the liver in which they undergo further chemical processes.
 3 The liver  destroys toxic substances which are usually  formed in the intestinal tract as well as some poisons which enter  the body from without. 
4 Jaundice is known to be the disease which is due to the presence of a large amount of bilirubin in the blood and tissues.