These bad habits aren't self-control failures - far from it. They are voluntary choices, and they are in fact self-control successes. Self-control is simply a tool to be put to some use, helpful or harmful. To live happy and productive lives, we need to develop not only our self-control, but also the wisdom to make good decisions about when and where to apply it.

8．What do most people think causes bad behavior?

　　　A．Being forced by others. B．Not having enough will power.

　　　C．Enjoying their first experiences. D．Following the examples of their friends.

9．The author mentions his experience in the third paragraph to prove ____.

　　　A．will power helps develop bad habits sometimes

　　　B．drinking beer is harmful to the health of teenagers

　　　C．self-control should be developed when one is young

　　　D．everyone can be challenged by different temptations

10．In the last paragraph, the author stresses that ____.

　　　A．without self-control, no one can succeed

　　　B．bad habits don't always lead to bad results

　　　C．applying self-control correctly is important

　　　D．people can develop wisdom from bad behavior

11．What does the passage mainly tells about ?

　　　A．The Author's First Sip of Beer B．Everyone Should Have Will Power

　　　C．Will Power Benefits Us D．Dark Side of Self-control

　　　Some inventions are so useful, but seem so simple, that we wonder why no one thought of them long ago. Post-it Notes, the pieces of paper that you can stick almost anywhere and then remove without leaving any sign that they are there, are an example of such an invention.

Post-it Notes were invented about twenty years ago by Art Fry, a scientist at 3M Corporation. The idea for the product came from an upsetting experience he often had while singing in his church choir. Fry used pieces of paper as bookmarks to mark the places in his book of songs, but these bookmarks were always falling out. He knew he needed a bookmark that would stay where he put it, but that he could remove without damaging the pages.