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Use the words given in capitals to form a word that fits the gap. Until the 20th century, most doctors were general (1) [PRACTICE]. Of those who specialized, the 2) [[MAJOR] war (2) [[MAJOR] war (3) [SURGERY] not regarded with much respect in many countries. Experts in other fields were found (4) [PRIMARY] on the staff of medical schools. Progress in science brought about fundamental changes to this (5) [SITUATE]. Modern science has made (6) [PREVIOUS] unimaginable (7) [DEVELOP] possible. These include the (8) [PRODUCE] of standardized drugs, the (9) [ANALYSE] of the (10) [CONSTITUTE] of blood and body tissues, and the use of X-rays. The (11) [INTRodUCE] of these and other (12) [REVOLUTION] techniques and practices led to a (13) [REQUIRE] for sophisticated facilities, staffed by highly-trained doctors and (14) [ASSIST]. This has (15) [PLAIN] been (16) [BENEFIT]. However, as (17) [TREAT] multiply and life (18) [EXPECT] rises, financing these (19)] [INCREASE] expensive facilities has become (20) ] [PROBLEM] for government worldwide.