填空题

Drugs have been a part of the American story since the very first day Columbus landed in the New World. The Taino Indians presented Columbus with a gift of tobacco, which would go on to become one of the most important drugs in our history. And if drugs have (36) since the beginning, so have drug problems. And so have (37) to solve those drug problems.
Since the 19th century when Americans first discovered new (38) drugs like heroin and cocaine, the whole society has (39) the problem of drug abuse and (40) .
When the 20th century began, the United States -- (41) with its first drug epidemic (42) set up effective restrictions: at home through (43) law enforcement and overseas by starting a world movement to limit opium and coca crops. (44) . The first epidemic was forgotten.
During the 1960s, drugs like marijuana, and psychedelics came on the scene, and a new generation embraced drugs. (45) . In 1973,the U. S. Drug Enforcement Administration was created to enforce federal drug laws. In the 1970s, cocaine reappeared. Then, a decade later, crack appeared, spreading addiction and violence at epidemic levels.
Today, the DEA’s biggest challenge is the dramatic change in organized crime. (46) .