000361

20 I. Translate the sentences into Russian. Define the tense. 1. Advances in drug therapy over the course of the 20th century have had a major impact on the treatment of infectious diseases. 2. All this work forms the basis for a new method of investigation. 3. Bone cells accumulate minute deposits of hard mineral to give bones their strong and light structure. 4. Since the early 1980s alternative medicine has become more and more popular. 5. Biologists have been investigating living species for many centuries. 6. Everybody knows that it is much easier to prevent a disease than to treat it. 7. To prevent serious diseases scientists have been developing vaccines for many years. 8. Inside every living organism, chemical reactions are going on all the time. 9. Large numbers of all kinds of molecules are raving about and bumping into one another. 10. The scientists have tested a new drug for common cold on laboratory animals. II. Circle the correct form of the verb. 1. The physician has just asked/have just asked the patient about his symptoms and complaints. 2. Disturbances in the function of the pancreas produce/produces digestive disorders. 3. For the last threemonths, Mr. Hill has been complaining/is complaining of progressive weakness. 4. They have performed/have been performing experiments on monkeys to test the new drug for two months. 5. Pharmacists are working/work on a number of research projects now. 6. Antibiotics, e. g. penicillin, destroy/destroys bacteria by killing them directly or by preventing them multiplying. 7. I think/am thinking , drugs have extended our lives and improved quality of life in countless ways. 8. The entire world  is working/has been working on the creation of an edible vaccine for more than ten years.