帮下忙看填什么介词?at ,in,on ,of ,next to ,under ,behind ,between选适当的

帮下忙看填什么介词?at ,in,on ,of ,next to ,under ,behind ,between选适当的介词填入空内 1、--What's that ____the wall?--It's a picture ___a classroom.2、We can see four windows ___the wallo ___the classroom.3、The ball is __the bed ,and the broom is ___the door.So you can't see them.4、Look __the picture ___my family.The boy __my parents is me.5、There are some birds __the tree.Can you see them?