阅读下面短文，从短文后各题所给的四个选项（A、B、C和D）中，选出可以填入空白处的最佳选项。
A smile is a facial expression showing pleasure, affection and friendliness. And it is the commonest way to show our good will perfectly 41 saying anything. A Chinese saying runs: “Never hit a person who is smiling at you.” It is a time-proven fact that the smile is a language all its own — a 42__ language—understood by the people of every nation in the world. We may not speak the same tongue as our foreign neighbors, 43 we smile in the same way. We need no interpreter for such a way of expressing love, happiness, or good will.
One day while 44 in a small town in southern California, it was my misfortune to be approached by a clerk whose personality conflicted with mine. He seemed most 45 and not at all concerned about my intended purchase. I bought nothing, and 46 angrily out of the store. On the outside stood a young man in his early twenties. His expressive brown eyes met and held mine, and in the next instant a beautiful, dazzling smile covered his 47 . The magnetic power of that smile 48 all bitterness within me, and I found the muscles in my own face happily 49 . “Beautiful day, isn’t it?” I remarked, in passing. Then, obeying an impulse(冲动), I 50 . “I really owe you a debt of 51 ,” I said softly. His smile deepened, but he made no attempt to 52 . A Mexican woman and two men were standing nearby. The woman stepped forward and eyed me inquiringly. “Sir, Carlos doesn’t speak English.” She 53 , “You want me to tell him something?” At that moment I felt 54 . Carlos’ smile had made a big person of me. My friendliness and good 55 towards all mankind stood ten feet tall.
“Yes,” my reply was enthusiastic and 56 , “tell him I said, ‘Thank you!’”
“Thank you?” The woman seemed slightly 57 .
I gave her arm a friendly 58 as I turned to leave. “Just tell him that,” I insisted. “He’ll understand, I am sure!”
Oh, what a smile can do! Although I have never seen that young man again, I shall never forget the __59 he taught me that morning. From that day on, I became smile-conscious, and I practice the art __60 , anywhere and everywhere, with everybody.
