Many years ago, when I worked as a volunteer at Stanford Hospital, I got to know a little girl _____ (name) Liz who was suffering from a rare and serious disease. Her only chance of recovery appeared to be a blood transfusion（输血） _____her 5-year-old brother, ____ had miraculously survived the same disease and had developed the antibodies needed to fight the _____(ill).
The doctor explained the situation to her little brother, and asked the boy if he would be willing to give his blood to his sister. I saw him hesitate（犹豫） for a moment _____taking a deep breath and saying, “Yes, I’ll do it ___it can save Liz.”
_____the transfusion progressed, he lay in bed next to his sister and smiled, as we all did, ____(see) the color returning to her cheeks. Then ____face grew pale and his smile faded. He looked up at the doctor and asked with a trembling voice, “Will I start to die right away?”
Being young, the boy had_____(understand) the doctor; he thought he was going to have to give his sister all of his blood.