—What do you think of the two backpacks? —______ of them are very nice.

    baseball is lost, he can’t find        .

—What does Mrs Li teach?—She is ________ English teacher, and she teaches __________ English very well.

－ Does the MP4 0n the desk belong to_______?－ No, it is _______.

 —Is this your baseball, David?   —No, it's not     . It's Helen's.