题目内容：

    A young man lost his job and became poor. Finally, he had run out of money and had to spend the night in his car. After several days of sleeping in his car, he walked nervously into a restaurant and ordered a big breakfast. After finishing it, he told the owner that he had lost his wallet. The owner walked behind the young man’s seat and picked up 20 dollars on the floor.

“Sir, you must have dropped this,” the owner said.

The young man couldn't believe his luck! He quickly paid for the breakfast and left.

On the way out of town, he began thinking this,“Maybe nobody dropped the money at all. That’s because the owner knew I was in trouble and he helped me.” From then on, the young man promised himself that he would try to help others if he was able to one day.

Now the young man lives near Kansas City. Each year, he donates（捐款）thousands of dollars. He is known as the“Secret Santa”，because at Christmas time each year, he gives money to homeless people on streets. Last year, he gave more than 50000 dollars away in Kansas City and New York City.

“I am very happy that I can help those people because they really need our help. I will continue giving my help to them. I once received help from others, too. So I understand the meaning when you help others.” he said.

1.Where did the young man spend the night after he ran out of money?（根据短文内容回答问题）

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2.Who picked up 20 dollars on the floor?（根据短文内容回答问题）

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3.The young man couldn’t believe his luck!（就画线部分问题）

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4.How much did the young man give away in Kansas City and New York City last year?（根据短文内容回答问题）

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5.In the passage, the underlined word “this” refers to_________.