As is often the case,sometime last month I walked on the street and found someone smiling or even trying to talk to me,but I couldn't recall who he or she was at all.I felt so ill at ease that all I did was only to gently stand there and try my best to smile as brightly as possible.
One day such a thing happened again.While I was greeting that beautiful girl,a crazy idea came into my mind that I decided to keep on talking with her though I didn't know her.Luckily,we had a pleasant conversation for ten minutes.But when saying good-bye to each other,we both suddenly found she had mistaken me for my elder sister.What an embarrassing experience it was!