根据场景完成对话 A:Afamous professor from Beijin
题型：情景交际
问题：
根据场景完成对话
A: A famous professor from Beijing University will come to our school to give us a speech on how to get along well with parents.
B: ① (那太好了!)
A:But I've just heard that he can't come.
B: ② (发生了什么事?)
A:An accident happened on his way to our school and he was sent to hospital.
B: ③ (真是出人意料!)