根据短文内容，判断句子正、误。

This is a picture of a classroom. The classroom is big and clean. You can see a teacher's desk, five desks and six chairs. You can see a girl and a boy, too. Three books are on the teacher's desk. A pencil case is on the desk. Two pens and two rulers are in the pencil case. A schoolbag is on a chair. A ball is on the floor. The girl is Gina. She is eleven. The boy is Mike. He is twelve. They are in Class Three, Grade Seven. They are good friends. The teacher is Mr. White. He is a good teacher.