阅读下面短文，从短文后各题所给的四个选项(A、B、C、D)中，选出可以填入空白处的最佳选项。
Smiling is the most desirable human behavior. We tend to overlook the power of smiling, 1 can work out many wonders and miracles.
In my spare time in the State, I loved to take a walk around the small community where I lived. 2 I met on the way, they always gave me a friendly greeting accompanied with a nice smile as soon as our eyes had 3 . Spontaneously(本能地), I smiled back. This kind of smiling exchange represented the most 4 part of my jogging experience in the State.
When it comes to doing business, my 5 is “I love to see my customers smile”. If a customer smiles when he sees you, it means he feels comfortable 6 with you. More importantly, it means he makes money. If he can make money, I get the business rolling.
On a personal note, my daughter's giggle(傻笑) is just like 7 which warms my inside the same way 8 the sun warms my body. It can 9 away any clouds and unpleasant feelings. 10 I see her photo, her giggle 11 around my ears. The little reserved and controlled smile of my wife, 12 , reflects the beauty of a matured and well-learnt woman. It is so 13 in my eyes. It can sometimes really turn me on.
Julia Robert's 14 is nothing but roaring like earthquake or volcano. It can overtake men and women alike. Americans may 15 in many other ways, but they all agree that Julia is America's sweetheart. Nobody can 16 her laughter plays a very good part in her acting. Once I tried some candy in a store, the owner asked me how sweet the candy is, I said sweeter than Julia Robert. Both of us 17 into a kind of Julia's laughter.
Yes, laughter is something we can not do without. Otherwise, our life would be too gloomy.
Smiling does not belong to human alone. Once I stayed at an American home 18 he had a little doggy by the name of Mini. Mini is a lovely pet. Every time we came home, she jumped up and down and insisted 19 giving me some lipping. When I held her gently and asked her to give me a little smile, she just 20 her mouth and half closed her eyes, looking like every inch of smiling. That left a deep impression on me.
What I love Los Angles most is not only it is the place where it has sunshine most days in a year but also where most people smile!
