学进去

My name is Jim. I'm a Canadian boy. I'm twelve. I'm a student ______ a middle school. I'm in Class Six, Grade One. Jack is my pen friend. He lives in ______ US. He is eleven. Here is a picture of _______ families. ______ look at it. His father, the one behind the tree, is a policeman. His mother, the one in the red coat, is a teacher. He has ______ sisters. They are twins. Their names ______ Mary and May. They have a cat. ______ name is Mimi. Look! It's ______ the floor. ______ twins are middle school students, too. They are in different ______.