---_____book is this?

--- I think it _____ Carla’s. It has his name on it.

---_____book is this?
--- I think it _____ Carla’s. It has his name on it.

---_____book is this?

--- I think it _____ Carla’s. It has his name on it.

1. A.
   Who is, could be
2. B.
   Who’s, might belong to
3. C.
   Whose, must be
4. D.
   Whose, can’t belong to

-Whose English book is this?

-I am not sure．It ________ be Kate's．

1. A.
   might
2. B.
   must
3. C.
   might belong
4. D.
   must belong

        —Jim, Tom is looking for his English book. Is this ______?

—No, that is ______. I don’t know where his is.

A. his, mine             B. he, mine            C. him, mine           D. his, my