题目内容：

 

1.

A: Is this a ______?

B: Yes, it is.

A: Where is it?

B: It is ______ the ______.

2.

A: Is ______ your sister?

B: Yes, it is.

A: ______ is your sister?

B: She is ______ her room.

3.

A: Where are my books?

B: ______ are ______ your schoolbag.