Actually, over 60 percents of the world s 580 million older people live in developing coun

Actually, over 60 percents of the world s 580 million older people live in developing countries. An increasing number of people in these lands are reaching old age【C1】______better health care and improvements in sanitation, housing, and【C2】______. Older people make【C3】______contributions by doing work for which they are not paid.【C4】______, an estimated 2 million children in the United States are being【C5】______by their grandparents, with 1.2 million of them living in their grandparents home . Thus older people provide shelter, food, and education and carry cultural【C6】______to their grandchildren while enabling mothers and fathers to continue as members of the work force.【C7】______, in the industrialized world, many volunteer organizations would not【C8】______without the contribution made by older people. They are also much - needed【C9】______. In some developing countries, where【C10】______30 percent of the adult population have contracted AIDS, older people care for their infected adult children after whose death they will have to raise their grandchildren.

【C1】

A．as usual as

B．as a result of

C．as a rule for

D．as a matter of

请帮忙给出正确答案和分析，谢谢！