听一段材料，回答下面几个小题。
Why did the son come back late?
A. He hurt his hands and knees.
B. He went to a pub with Linda.
C. He waited a long time for the bus.
What was the old lady doing in the middle of the road?
A. Looking for something.
B. Struggling to stand up.
C. Trying to seek help.
What happened to Linda?
A. She was fired.
B. She got injured.
C. She had an accident.
Where was the witness?
A. Outside the pub.
B. At a bus stop.
C. In his car.