---________ your book?

---Yes, thank you．

1. A.
   What's
2. B.
   Is this
3. C.
   Are these
4. D.
   Where's

—Is this your book, Alice?  —Yes, it is ____ book. Thank you.

 —Is this your book, Alice?  —Yes, it is ____ book. Thank you.

A．mine             B．I                 C．me              D．my

.—Is this your book, Jane?
—_______. Thank you!