完形填空（共15小题；每小题2分，满分30分）
阅读下面短文，掌握其大意，然后从1~15各题所给的四个选项A、B、C和D中，选出最佳选项，并在答题卡上将该项涂黑。
One day, while I was walking to work, I decided to bring some flowers that I had picked from my garden that morning. On the way, I 1 a stranger and presented the flowers to him with a smile card. 2 by the sense of joy I felt from giving flowers to another person, and may be 3 his day, I wanted to do it again.
