题目内容：

阅读下面材料，在空白处填入适当的内容（1个单词）或括号内单词的正确形式。

These days, people 1. (do) manual work often receive far more money 2. clerks who work in offices. People who work in offices are frequently 3.(refer) to as 'white-collar workers' for the simple reason 4. they usually wear a collar and tie to go to work. 5. is human nature, that a great many people are often willing to sacrifice higher pay 6. the privilege of becoming white collar workers. This can give rise to curious situations, 7. it did in the case of Alfred Bloggs who worked as a dustman for the Ellesmere Corporation. When he got married, Alf was too 8.(embarrass) to say anything to his wife about his job. He 9.(simple) told her that he worked for the Corporation. Every morning, he left home 10.(dress) in a smart black suit.