练习题：
1. The boss stressed the criterion that a qualified waiter must do every service ____ the satisfaction of his customers.
A) for B) by C) on D) to
2. Only after many years of hard work ____ that money alone does not lead to happiness and success.
A) I did realize B) had I realized C) did I realize D) I had realized
参考答案：
1. D
老板强调指出，要做一名合格的服务员必须使自己的服务让顾客满意。本题考察介词的使用。do sth. to the satisfaction of sb. 的意思是“把某事做得使某人满意”，其他三个选项均不合题意。
2. C
在经过多年的努力工作之后，我才意识到金钱本身并不能带来幸福和成功。本题考察考生对虚拟语气和倒装句的正确使用。only after 表示“在……之后”，要求后面跟虚拟语气，同时，如果把only after置于句首则要求用倒装语序，综合考虑只有C答案正确。