补全对话:
根据中文提示，把对 话中缺少的内容写在线上。这些句子必须符合英语表达习惯。打句 号的地方，用陈述句;打问号的地方，用疑问句。
提示：Mary 与 Bill 不期而遇，邀请他一起吃晚饭。但Bill 当晚7 点要去北京，下周一回来。 Mary 让Bill回来后给她打电话。
(Mary=M;Bill=B)
M:Bill,is that you?I haven't seen you for a long time.
B: Hi,Mary,Great to see you again. 51 ?
M:Fine. Why don't we get together and have a chat? How about（）this evening?
B: Well,it sounds great,but I'm 53 at7 o'clock.
M:What a pity!
B: Well,I'll be back_ 54 _.We can find a time to meet again.
M:Okay. 55 when you are back.
B: No problem.Goodbye!
M:Bye!
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