–Is this your pen? —No, it isn’t. It’s     pen.

— Do you know the young boy  ________ is reciting a Tang poem over there?   — Yes. He's a friend of  ________ .

      is the price of the dictionary?

—         is Tommy?—Maybe he is in the hospital. He told me that he had sore eyes.

－Are the keys yours?－No, they aren’t _____. I think they’re Jason’s.