根据短文内容，判断下面句子正(T)、误(F)。

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 school bag is behind a chair. A ball is on the floor.
The girl is Lucy, and she is eleven. The boy is Mike, and he is twelve. They are in Class Two, Grade Seven. They are friends. Their teacher is Miss Green. She is not here.