000361

21 9. More recently, modern medical research  is giving/has given us some powerful medicines. 10. I am participating/participate  in a conference the day after tomorrow. III. Complete the sentences using the correct form of the verb in the brackets. 1. Numerous investigations and experiments … (to show) that sleep is more necessary for a human being than food. 2. He … (to investigate) the placebo effect since the early 2000s. 3. Helicobacter pylori … (to be) the subject of intensive research nowadays. 4. People … (to know) about the medicinal properties of plants for thousands of years. 5. She … (to do) research into the causes of cancer this year. 6. The body … (to use) cholesterol to produce vitamin D and bile. 7. The surgeon … (already/to operate) on a patient for acute appendicitis. 8. The patient … (to suffer) from chronic bronchitis for many years. 9. … (you/to take) any medication at the moment? 10. Doctors … (to perform) heart transplant operations since the 1960s. IV. Complete the sentences using the correct form of the verbs in the box. to discuss to be to investigate to eradicate to occur to become to produce to fall to save to define 1. Today medicine … two main categories of causes of diseases: external and internal. 2. Since discovery of insulin in 1922 it … millions of lives. 3. He … the causes of the disease at this moment. 4. Asthma … a disease of the lungs that causes wheezing, coughing, chest tightness and difficulty breathing. 5. Medical scientists … more and more interested in allergies. 6. We … the unfavorable effect of this medicine for two hours. 7. Many chemical changes … in nature. 8. The bone marrow … erythrocytes. 9. Cancer death rates … since the 1990s. 10. Vaccination … smallpox as a natural hazard.