---Tony, can you play_________ piano?---No, But I can play______ chess.
You must be very tired. Why not ________ a rest?
I don’t know who ________ the boy stand here. How poor he looks.
—Mum, who called me this afternoon when I was out?—A girl calling ______ Lucy.
— _________ will the foreign students be back from Nanjing?— In two days, I think.
There's bread here. Go and buy some for us.