20、A：Hello, Li Lei!   1  didn’t you come to school on time this morning?

B：There was a traffic accident．

A：How did it happen?

B：When a girl was coming to school  2  bike, a car hit her and she was badly hurt．

A：What happened then?

B：I was just on the way to school, and I helped the driver take the girl to the hospital．The doctor looked her over at once．She was saved at last．

A：How is she now?

B：She’s feeling much  3 ．

A：Great! You have   4   a good job．But I think safety is above (在……之上) all．We should try  5  best to keep safe．

B：You’re right．