A. TO B. IN C. OVER D. ATDRUGSDRUGS ARE ONE OF THE (56) ________ P...

10. A. to B. in C. over D. atDRUGSDrugs are one of the (56) ________ profession’s most valuable tools. Doctors prescribe drugs to(57) ________ or prevent many diseases. Every year, penicillin and other (58) ________ drugs save thelives of countless victims of pneumonia and other dangerous infectious diseases. Vaccines prevent attacksby such diseases as (59) ________, polio, and smallpox. The use of these and many other drugs (60)________ helped millions of people live longer, healthier lives than would (61) ________ have beenpossible.Almost all our most important drugs, however, were unknown before the 1900’s. For example, thesulfa drugs and antibiotics did not come into use (62) ________ the late 1930’s and early 1940’s. Beforethat time, about 25 percent of all pneumonia victims in the United States died of the disease. The newdrugs quickly reduced the (63) ________ rate from pneumonia to less than 5 percent. Polio vaccine wasintroduced in 1955. At that time, polio struck about 30,000 to 50,000 Americans each year. (64)________