Perhaps I am courageous, but that’s because I’ve had some inspiring teachers. I’ll tell you about one of them. Many years ago, when I worked 1 a volunteer at Stanford Hospital, I got to know a little girl named Liza 2 was suffering from a rare and serious disease, Her only chance of 3 (recover) appeared to be a blood transfusion (输血) from 4 five-year-old brother, who 5 (survive) the same disease and developed the antibodies needed to combat the illness. The doctor explained the situation to her little brother, and asked the boy 6 he would be willing to give his blood to his sister. I saw him hesitate for a moment 7 taking a deep breath and saying, 'Yes, I’ll do it if it will save Liza.' As the transfusion progressed, he lay in a bed next to his sister, 8 (smile). But then his face grew pale and his smile faded. He looked at the doctor and asked with 9 trembling voice, 'Will I start to die fight away?' Being young, the boy had misunderstood the doctor. He thought he was going to have to give her 10 his blood.