阅读下面短文, 从短文后各题所给的四个选项(A、B、C、D)中, 选出可以填入空白处的最佳选项。

    About one year ago, a couple with three children moved into the apartment next door to me. I never heard any noise from the children. but I often heard the parents 1 shouting at the kids, not in a nice tone, but in a(n) 2 one.

    We often 3 in the hallway. I always greeted them, 4 the only answer I ever got was a ”hello” from the eight-year-old girl. I usually 5 to see my doctor and one day when I returned they were just 6 their apartment and the little girl was 7 the outside door open for the others. I 8 in the car doing 9  things because I wasn't eager to be snubbed (冷落) again. Finally, I got out of my car and walked towards the door. The parents were telling her to 10 to get into the car, but the little girl was still holding the door, 11 me! I hurried although I was still in pain from my injury.

    I forgot to tell her how 12 I was for her kindness. I wrote a note saying how much her act of kindness had 13an old man's heart.

    The next day there was a(n) 14 on my door and it was the little girl and her father. She was quite 15 of her behavior and thanked me. Then I noticed her mother standing there, too. Her parents 16 me. Too.

    Now when we met in the hallway we always greeted each other, in a friendly17.

    Last night there was a heavy snow. I looked out at my car and 18 how I was going to keep my doctor's 19 because I could only walk for a short time. This morning when I opened the front door, all the snow was removed.

    Isn't it 20 that the small kind act of an 8-year-old girl can change so many things for the better? It is said that good things come from small acts.