题目

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 21 I think about myself. I am happy that I am becoming a 22 person. I think my 23 started when I was at Palomar College. At first, I just wanted to get my 24 and be left alone. I thought I was smarter than everyone else, so I hardly ever   25 to anyone in my classes. By the end of my first semester, I was really 26. It seemed as if everyone but me had made friends and was having fun. So tried a(n) 27 . I started asking people around me how they were 在实数，0.560，，，中，无理数有__________.