A. TO B. IN C. OVER D. AT DRUGSDRUGS ARE ONE OF THE (1) _______...

10. A. to B. in C. over D. at DRUGSDrugs are one of the (1) ________ profession’s most valuable tools. Doctors prescribe drugs to (2) ________ or prevent many diseases. Every year, penicillin and other (3) ________ drugs save the lives of countless victims of pneumonia and other dangerous infectious diseases. Vaccines prevent attacks by such diseases as (4) ________, polio, and smallpox. The use of these and many other drugs (5) ________ helped millions of people live longer, healthier lives than would (6) ________ have been possible.Almost all our most important drugs, however, were unknown before the 1900’s. For example,the sulfa drugs and antibiotics did not come into use (7) ________ the late 1930’s and early 1940’s.Before that time, about 25 percent of all pneumonia victims in the United States died of the disease.The new drugs quickly reduced the (8) ________ rate from pneumonia to less than 5 percent. Poliovaccine was introduced in 1955. At that time, polio struck about 30,000 to 50,000 Americans eachyear. (9)________ 1960, the use of the vaccine has reduced the number of new polio cases to about