根据对话内容，从方框中选择恰当的选项补全对话，其中有两项多余。

A：Betty, you look pale(苍白的)．Are you all right?

B：A boy was riding his bike and listening to music．

A：That's very dangerous．What were you doing at that time?

B：When the lights were turning to red，a car appeared．It wasn't going fast，but it didn't stop．

A：

B：No．And the driver was talking oh his mobile phone．He didn't notice the boy．

A：Did the car hit the boy?

B： He just fell off his bike and hurt his knee．

A：That's too bad．

B：So when we're on the bike．we must be careful !

A：Yeah!

B：Yes, you're right．And we shouldn't listen to music.

A．We mustn't ride too fast． B．Did the boy stop? C．I was waiting to cross the road． D．Did the boy have a sore back? E．I'm OK, but I saw an accident． F．Yes．I'm glad to say he was not seriously hurt． G．I had dinner with my friend．