I. 补全对话 ( A )A: Hello! Could I _to the headmaster, please? B: _ on for a moment, please. Im sorry he isnt here _ now. may I help you?A: Thats very kind _ you, but I want to speak to him _ my son, Jim Green. I would like to _ him as soon as _, please.B: Are you _ later today, Mr. Green?A: Sorry. Im free every day _ today.B: Are you able to come here tomorrow?A: I think so. What time?B: _