阅读下文并回答问题。
This is a schoolbag. What’s in the backpack? __A__  They are an eraser, a pencil case, a notebook ... Is this Emma’s eraser? __B__  Is that Ben’s pencil case? __C__ No, it is Jack’s pencil case. Look! These are two dictionaries. And those are five books.  What’s in the pencil-box? Three pens. Oh, what is this? It’s my notebook.
短文中漏掉了一句：Yes, it is. 应该放在A，B，C中的哪一处？
答：应该放在________处。
Is a notebook in the schoolbag?
What is in the pencil-box?