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!)