Listen to the passage again and fill in the blanks with the missing words. Recently VOA's reporters have explored some of the issues facing health care systems around the world. Today we talk about three separate issues with one thing in common: they all involve medicines. One problem is counterfeit medicines. These can be difficult even for highly trained medical professionals to identify. Counterfeit drugs are made to 1) _____________________________________ whose names they are sold under. But they do little or no good, and in some cases might be harmful. Patients also 2) _________________________________________. The World Health Organization says an estimated ten percent of the drugs sold worldwide are counterfeit. In developing countries, however, twenty-five percent or more of the medicines taken are believed to be counterfeit. It is difficult to 3) __________________________________. But many experts believe criminals in India and China are involved. The W.H.O. has created a group to 4) _________________________________________ of medicines in developing countries. One way that drug makers show government agencies that 5) ____________________________ is through human trials. Yet these can sometimes present great risks to the people involved. Recently, six men in London 6) _____________________________ during tests of an experimental drug. They developed severe reactions within minutes of being injected with a drug for leukemia and other diseases. The American drug research company Parexel International says 7) __________________________________. The British government has formed a committee to consider stronger rules for human drug trials. Public interest groups argue that many drug companies 8) ___________________ in testing new medicines. Yet the safety and effectiveness of any drug can also depend on how it is used. Disease-causing organisms can become resistant to drugs, especially if the medicines are not taken correctly. The W.H.O. has warned of such a threat to 9) _____________________________ for malaria. The agency is trying to pressure drug companies only to sell artemisinin in combination with other malaria drugs. Experts say taking it alone will only 10) _______________________________________________. Some companies have agreed to stop selling it alone, but others have not.