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21 Give the subject and the predicate of the following sentences:

1 When a muscle fiber contracts so that its length does not change, one of the discs becomes shorter and the other longer. 2 The pressure in the cranial cavity is increased as a result of the increase in arterial pressure. 3 In man the corpuscles may compose from 39 to 50 per cent of the blood volume. 4 Can life exist without oxygen? 5 A cardiac cycle is composed of the wave of contraction and a period of rest. 6 In the human body sex differences exist in the inner organs and their functions. 7 The pleura is a special tissue which covers the lungs with a thin layer. 8 Different actions which are repeated every day before going to bed also act as stimuli which produce the process of inhibition.

22 Pick out the verb in each sentence and say whether it is the active or passive voice:

1 The doctor has observed no considerable changes in the lungs. 2 No difference exists between the substance of the bones of the lower and upper extremities. 3 The surgeon came to no exact conclusion after he had examined the patient. 4 If chemotherapy had not been discontinued last week liver damage would have become too severe. 5 Profuse external bleeding had to be controlled in time lest the patient would die. 6 The physician insisted that the patient should follow a strict diet. 7 This idea is likely to be supported by everybody. 8 It is important that all surgical instruments will be sterilized adequately.

23 Write questions to which these sentences are answers:

1 After this worker had been taken to the hospital, he was examined by some specialists. 2 While the patient was examined, he complained of pain in his stomach. 3 He wants to be taken to the hospital where professor K. works. 4 After a great number of scientific research institutes had been established, the scientists have possibility to carry out different researches. 5 D. Samoilovych, born in Ukraine, was known in Europe where his works on the fight against the plague were republished repeatedly. 6 The patient had been operated on in due time and that is why he recovered quickly. 7 The results of this experiment provided fresh proof that an organism is a complex system.

24 Put a special question to each sentence:

1 This system makes it possible to restore the working capacity in 82 per cent of the people who have had an infraction of the myocardium. 2 It has been established that the roots of the disease can often be traced back to childhood. 3 The Institute is also studying the question of organizing the pulmonological service and some measures which are essential if we are to achieve our aim of having a population with healthy lungs. 4 If the heart transplant problem is far from its solution, them the making of artificial organs is less realistic. 5 Hyperbaric oxygenation was also used for the first time in cases where women with congenital or acquired faults of the heart were giving birth.

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