---Where are the books?

---________ on the sofa.

1. A.
   It's
2. B.
   They're
3. C.
   There are
4. D.
   These are

 --- Where are my books?      --- T__________ on the sofa.

---Where are the books? ---________ on the sofa.

[　　]

 — Where  are ___________?

— They are on the sofa.               

A. my hat         B. my backpack    C. my books