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: Hi, Mary! Did you watch TV last night?
B: ____ What happened?
A: A bus accidentl
B: ____
A: It happened in America!
B: Was it serious (严重的)?
A: ____ Many people died and a lot of people hurt themselves.
B: I' m sorry to hear that. ____?
A: Because the driver wasn't driving carefully.
B: ____?
A: He was talking on his mobile phone at that time.
B: That's new dangerous!
