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 states, 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 (伴随) with a nice smile as soon as our eyes had 3__. spontaneously(本能的, 自动的), i smiled back. this kind of smiling exchange represented the most enjoyable part of my jogging experience in the states. when it comes to doing business, my 4__ is “i love to see my customers smile”. if a customer smiles when he sees you, it means he feels comfortable 5__ with you. more importantly, it means he makes money. if he can make money, i get the business rolling.