Упражнение 3. Поставьте глаголы, данные в скобках, в Present Simple or Present Contin.); Дайте перевод предложений: 1. The heart (to function) as an effective pump. 2. People (to vary) in their reaction to different antigens. 3. Lack of sufficient insulin (to result) in diabetes. 4. The action of sunlight on the skin (to change) at the present moment. 5. Several recent studies (to show) a connection between stress and illness nowadays. 6.More and more men (to enter) the nursing profession at present.