焦炭的灰分高低，主要取决于（）的成份。

用所给单词的适当形式填空，其中有两个是多余的。

clothes, use, get, pass, do, play, spend, in, money, hard, owner, expensive

         Life used to be fun for teenagers. They used to have money to 66_______, and free time to spend. They used to wear teenage  67_______ and meet in teenage coffee bars and discos. Some of them still do now. But for many young people, life is 68______ now. Jobs are hard to find. There’s not so much  69______. Things are more expensive, and it’s hard to find a cheap place to live 70______. Teachers say that students work harder than they  71______to. They are more interested in 72______ exams. They know that good exam results may 73______ them better jobs. Most young people worry more about money than their parents 74______ twenty years ago. They try to spend less and save more. They want to be able to get home of their 75______ one day.