A．for B．without C．as D．about21().……

During the 1980s,unemployment and underemployment in some countries was as high as 90 percent.
Some countries did not (21) enough food; basic needs in housing and clothing were not (22) Many of these countries looked to the industrial processes of the developed countries (23) solutions.
　　 (24) , problems. cannot always be solved by copying the industrialized countries . Industry in the developed countries is highly automated and very (25) . It provides fewer jobs than labor-intensive industrial processes, and highly (26) workers are needed to (27) and repair the equipment. These workers must be trained (28) many countries do not have the necessary training institutions. Thus, the (29) of importing industry ecomes higher. Students must be sent abroad to (30) vocational and professional training. (31) ,just to begin training, the students must (32) learn English, French, German,
or Japanese. The students then spend many years abroad, and (33) do not return home.
　　All countries agree that science and technology (34) be shared. The point is: countries (35) the industrial processes of the developed countries need to look carefully (36) the costs, because many of these costs are (37) . Students from these countries should (38) the problems of the developed countries closely. (39) care, they will take home not the problems of science and technology, (40) the benefits.

A．for
B．without
C．as
D．about