阅读短文, 并从短文后各题所给的四个选项（A、B、C和D）中选出最佳选项。
I used to be a very self-centered person, but in the past two years I have really changed. I have started to think about other people 1 I think about myself. I am happy that I am becoming a 2 person.
I think my change started when I was at Palomar College. At first, I just wanted to get my 3 and be left alone. I thought I was smarter than everyone else, so I hardly ever 4 to anyone in my classes. By the end of my first semester, I was really 5. It seemed as if everyone but me had made friends and was having fun. So I tried an experiment. I started asking people around me how they were doing, and if they were having trouble, I offered to help. That was really a big 6 for me. By the end of the year, I had several new friends, and two of them are still my best friends today.
A bigger cause of my new 7, however, came when I took a part-time job at a Vista Nursing Home. One old lady there who had Alzheimer's disease(老年痴呆症) became my 8. Every time I came into her room, she was so 9 because she thought I was her daughter. Her real daughter never 10her, so I took her place. She let me 11 that making others feel good made me feel good, too. When she died, I was heartbroken, but I was very grateful to her.
I think I am a much 12 person today than I used to be, and I hope I will not 13 these experiences. They have 14 me to care about other people more than about myself. I 15 who I am today, but I could not say that a few years ago.
