In the United States, older people rarely live with theft adult children, But in many other cultures children are expected to care 【21】______ their aged parents. In some parts of Italy, the percentage of adult children who 【22】______ with their parents 【23】______ 65 to 70 percent. In Thailand, too, children are expected to care for their elderly parents; few Thai older people live 【24】______ . What explains these differences in living arrangements 【25】______ cultures? Modernization theory 【26】______ the extended family household to low levels of economic development. In traditional societies, the elderly live with their children in large extended family units for economic reasons. But with modernization, children move to urban areas, leaving old people 【27】______ in 【28】______ rural areas. Yet modernization theory cannot explain why extended family households were never common in the United States or England, or why families in Italy, which is fully modernized, 【29】______ a strong tradition of intergenerational living. Clearly, economic development alone cannot explain 【30】______ living arrangements. Another theory associates intergenerational living arrangements with inheritance patterns. In some cultures, the stem family pattern of inheritance 【31】______ . 【32】______ this system, parents live with a married child, usually the oldest son, who then 【33】______ their property when they diE.The stem family system was once common in Japan, but changes in inheritance laws, 【34】______ broader social changes brought 【35】______ by industrialization and urbanization, have 【36】______ the 【37】______ . In 1960 about 80 percent of Japanese over 65 lived with their children; by 1990 only 60 percent did--a figure that is still high 【38】______ U.S. standards, but which has been 【39】______ steadily. In Korea, too, traditional living arrangements are 【40】______ : the percentage of aged Koreans who live with a son declined from 77 percent in 1984 to 50 percent just 10 years later. Although most elderly Koreans still expect to live with a son, their adult children do not expect to live with their children when they grow olD. 【21】 A.about B.after C.for D.over