题目内容：

语法填空。

After graduation from college, I started to sell. Soon I discovered that the worried expression I 1. (wear)since childhood meant sure failure. I knew it wasn't going to be easy to change that expression on my face left by so many years of 2. （hard）.It called for a complete change in my view on life. Here is the method I tried.

Each morning during a fifteen­minute bath, I determined to cultivate a big, happy smile. I found out, however, that it couldn't be a 3. (force) smile developed just for the purpose of putting dollars in my pocket. It had to be 4. honest­to­goodness smile from down deep inside， an outward expression of happiness from within!

Let's see 5. starting off with a good fifteen­minute training of the smile muscles helped me during the day. 6. entering an office I would think of many things I had to be thankful for, work up a big smile and then enter. Seldom did it fail 7. (get) the same smile 8. return from the person I met. I also found that it pleased people when I passed them on the street to give them a cheerful smile.

Give every living soul you meet the best smile you have ever smiled in your life, 9. see how much better you feel and look. It's one of the best ways I know to stop worrying, and start living. When I began doing this, I found 10. more welcome everywhere.