材料
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（52）this
evening？
B:Well, it sounds great, but I'm（53）at 7 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！
第(51)填______
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