Directions: Choose from the following transitional expressions and put them in the blanks in the paragraph. in addition as finally for example even if also The erosion of the middle of the labor market is easy to misinterpret, because its roots are multiple. During the 1970s, the entry into the work force of an unprecedented number of women and of young adults born during the baby boom resulted in too many workers for the jobs available, and depressed wages. The decline of the middle ___1___ has something to do with the explosive growth in world trade since 1960. ___2___ manufacturing technologies have become more mobile, and multinational firms more footloose, production jobs have migrated from the U.S. to countries where wages are low. __3____, technology itself has helped to provoke the shifts in the job market. __4____, fewer American workers would have been needed to make steel in 1980 than in 1960 ___5___ the pressures of global competition had not been a factor, because new machines have made many of their tasks redundant. ___6___, the high rate of unemployment caused by these trends has tended to drive wages down further, especially at the low end, since it forces unskilled workers to compete for their jobs with unemployed people who are willing to do the work for less.请填入正确的单词 （注意单词首字母的大小写）1. __________