Labor Market DeclineThe decline of the labor market is easy to m

Labor Market Decline
The decline of the labor market is easy to misinterpret （interpret）. There are many reasons for that. During the 1970s, large numbers of women and young adults __1___ （bear） during the baby boom entered into the work force. That ___2___ （result） in too many workers for the jobs available and depressed wages. The decline also has something to do with the explosive ___3___ （grow） in world trade since 1960. As ___4__ （manufacture） technologies have become more mobile, production jobs have __5___ （move） from the U.S. to countries where wages are low. In ___6___ （add）, technology itself has helped to cause the shifts in the job market. For example, ___7____ （few） American workers are needed to make steel today than in the past, because new ____8___（machine） have made many of their tasks ___9___ （necessary）. Finally, the high rate of ____10____ （employment） caused by these factors has tended to drive wages down further.

9___.
【正确答案】：unnecessary
【题目解析】：make sb adj 构成谓语+宾语+补语的机构，所给单词necessary已经是形容词，根据意思，需要改成否定含义，答案是unnecessary。