根据对话内容，在每个空白处填入一个适当的句子，使对话完整、合乎情境。

A: You are late for school yesterday morning. ?

B: There was a traffic accident on my way to school.

A: ?

B: At about seven o' clock.

A: ?

B: A driver couldn't stop his car and the car hit a girl.

A: I' m sorry to hear that. ?

B: I was walking along the road at that time.

A: Did you help to send the girl to the hospital?

B: Luckily, the doctor said she was not hurt badly.