题目内容：

    Today is as normal(正常) as usual, but I am very happy today. I help an old granny. When I took bus to school this morning, an old granny sat next to me. She was so gracious（和蔼的） that looked like my own grandmother. She talked to me. Suddenly, she had a cough and then she seemed not to breathe. I told the driver to stop the bus immediately and then I called 120 for an ambulance（救护车）. The ambulance arrived quickly. I went to the hospital with her. I help her to call her son. After checking, the doctor said that she wasn’t very serious. When her son came, he thanked me for calling the ambulance. When I found the old granny was fine, I left and went to school. I was late for school, but I explained everything to my head teacher. My head teacher praised（表扬） me. I felt very happy.

阅读短文，回答下列问题。

1.How did the writer go to school this morning?

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2.What did the writer do when he found the old granny coughed?

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3.When did the writer leave?

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4.Who praised the writer?

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5.Why was the writer late for school?

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