Song Li is a five-year-old girl. She lives with her parents in a big house. She usually plays with her mother when her father goes to work. Her father teaches history in a school. He always comes home with delicious(美味的) food. And Song Li is happy to see her grandparents too, because they always come to see her with delicious food.

Su Yong is a thirteen-year-old boy. He is in Mr. Wang's class, Class 3, Grade 7. He is good at computer science and he usually does his homework on the computer. He hopes(希望) there'll be more robot(机器人) teachers some day and they will help to check(检查) homework. Su Yong's father is a doctor and drives to work every day. Sometimes he drives Su Yong to school. But there is too much traffic on the way to school. Su Yong is afraid of being late, so he usually rides his blue bike to school.