My name is Bill. I'm an American boy. I'm twelve. I'm a student in a middle school. I'm in Class1, Grade 7. Li Lei is my friend. We're in different classes. He is eleven. Here is a photo of his family. Let's look at it. His father, the one behind the tree, is a policeman. His mother, the one on the bike, is a Chinese teacher.  He has two sisters. They are twins. They have a cat. Its name is Mimi. Look! It's on the floor under the table. The twins are middle school students, too. They look after  me at school. We are good friends. Who looks after Bill at school?    _  .
His parents The twins Mimi and Bill His parents and Bill