初中英语物主代词单选题

—Whose shirt is this? Is it ________, Mike?
—No, it isn’t. I think it’s ________.
A. yours, Jack’s              B. yours, Jack                C. your, Jack’s

—Is this ________ book?— No, it isn’t. ________ book is at home.
A your; Your            B. her; My                     C. her; His                                          D. Your; My