In my mind, the most unforgettable thing happened on a sunny Sunday.

On this day, I went shopping with my mother in a happy mood. The two of us walked to the platform of the bus and waited quietly for the bus to arrive. After a while, the bus came. We paid the money and got on the bus quickly. At first glance, there are so many people riding today! Well, there are only three seats left. My mother, I and a little sister sat in the empty seats.

I took the bus and enjoyed the beautiful scenery outside the window. The bus arrived at the station, when only an old woman got on. Grandma looks over 7 years old with white hair. Holding a vegetable basket in one hand and a cane in the other. At this time, there are no empty seats in the car, and I am hesitant to give up my seat or not. Just as I was about to give up my seat, a sweet voice interrupted my action. I looked back and saw that it was the little sister. She said, "Grandma, please sit here." The old woman was moved and said, "Little sister, thank you." "You're welcome, it's what I should do." There was a smile on my little sister's face, and so did my grandmother, and the passengers showed their approval.

this is an unforgettable thing for me.