选择正确的句子补全对话，将其大写字母编号写在横线上。
A. where’s my new schoolbag?
B. Is it in the box?
C. Your room is so messy （不整洁的）
D. Yes, it is.
E. Is it on the bed?
Ben: Mum, 【小题1】
Mum: 【小题2】
Ben: No, it isn’t. Oh, the box is in front of the bed.
Mum:【小题3】
Ben: No, it isn’t. It isn’t on the bed.
Mum: Is it behind the desk?
Ben: 【小题4】 Thank you, Mum.
Mum: 【小题5】Let’s clean it.
Ben: OK.