Prepositions

It was a hard job for Ms.hamilton to arrange the seating plan for our calss.
When she walked INTO the classroom,she found that most students had already occupied the seats FOR the fans because it is comfortable especially in summer.
May,sat BESIDE/NEXT TO Mary because they were good friends.IN FRONT OF May was Amy.She was a bit shorter than May.The girls had already put their schoolbags ON the desks and the boys were sitting AT the back of the classroom.They pur all their belongings including footballs UNDER the desks.

This kind of arrangement is not a good one.As boys and girls form their groups without any formal interactions AMONG them.Class discipline is extremely poor when a teacher is writing notes ON the blackboard with his back OVER all students.