Read the following passage and choose the best answer for each blank.

Under the global "health for all" strategy, WHO (the World Health Organization) and its members have placed special emphasis (26) ________ the developing countries. Nevertheless, the benefits of WHO's international health work are benefited by all countries, including the most developed ones. For example, all nations have benefited from their contributions to the WHO programs that led to the global (27) ________ of smallpox and to better and cheaper ways of controlling tuberculosis. (28) ________ is a key word in WHO's programs. The organization believes that immunization, (29) ________ prevents the six major diseases of childhood -diphtheria, measles, poliomyelitis, tetanus, tuberculosis, and whooping cough, should be (30) ________ to all children who need it. WHO is leading a worldwide campaign to provide effective immunization for all children in (31) ________ with UNICEF. Provision of safe drinking water for all is one of the objectives of the International Drinking Water Supply and Sanitation Decade proclaimed by the UN General Assembly in 1980 and (32) ________ by WHO. WHO is also active in international efforts to combat the diarrheal diseases, killers of infants and young children. The widespread introduction of oral rehydration salts, together with improved drinking water supply and sanitation will greatly reduce childhood mortality from diarrhea.

WHO's program for primary health (33) ________ comprises eight essential elements: education concerning prevalent health problems and the methods of preventing and controlling them; promotion of food supply and proper nutrition; maintenance of (34) ________ adequate supply of safe water and basic sanitation; provision of maternal and child health care, including family planning; immunization against the major (35) ________ diseases; prevention and control of locally endemic diseases; appropriate treatment of common diseases and injuries; and provision of essential drugs. These eight elements were defined in the Declaration of Alma-Ata, which emerged from the International Conference, on Primary Health Care in 1978.

immunization against the major (35) ________ diseases