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--There is ________book on the shelf，would you please get ________ book for me．

--With pleasure．

A．a; the              B．the; a              C．a; a            D．the：the

---Is______ book on the desk yours?

---Yes, it's______ my book．

A．the, a        B．the, the         C．the, /         D．a, the

一Is ______ book on the desk ______ useful one?

一No, it isn’t．

A．the；an        B．the；a           C．a；the        D．the；the

---Is ________book on the desk __________useful one?

---No, it isn’t.

A．the; an        B．the; a         C．a; the        D．the;/