When a young man starts to earn his own living,he
can no longer expect others to pay his food,his clothes, 1.
or his room,but he has to work till he wants to live 2.
fortable.If he spends most of his time playing 3.
about in the way that he used to as a child,they will go 4.
hungry.And if he breaks the laws of society that he used 5.
to break the laws of his parents,he may go to the prison. 6.
If,therefore,he works hard,keeps out of trouble and has 7.
better health,he can have the great happiness of seeing 8.
himself to make steady progress in his job and of 9.
building up for himself his own position in society. 10. 1.pay后加for
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(答案→)1.pay后加for
解析：
1.pay后加for pay for sth.“花钱买……”为固定搭配。
2.till→if 由上下文可知此处应该表示条件。
3.fortable→fortably 用副词修饰动词live。
4.they→he 根据上下文的意思分析，从句主语与主句主语的人称要一致。
5.that→as 用as表示“如同……一样”。
6.去掉第二个the 固定短语go to prison“坐牢”，中间不使用冠词。
7.therefore→however 上下文表示转折关系，所以用however。
8.better→good 依据上下文逻辑需用形容词原形。
9.去掉to see为感官动词，其后的动词不定式不使用to。
10.正确。