题目内容：

Taking part in charity is not just for grown-up people. Children can do it too! Melvin Sheppard, 14, an American student, has done charity work for eight years. He has also encouraged his classmates to join him.

Melvin studies at William Allen Middle School in Philadelphia. Recently, he collected $1,500 by himself and $487 from his classmates to donate to Cooper University Hospital.

Melvin was born nine weeks premature (早产) in Cooper University Hospital, weighing 2.6kg. His father told him how Cooper saved his life, so he felt thankful to the hospital.

Melvin's classmates joined him as soon as they found out about his kind behavior(行为). Their teacher, Michael Berner, also held a class with them about helping others. “It wasn’t really about the money,” Berner said. “It was about the fact that they were doing something good.”

“It is great, helping someone that I know,” said Jordan, Melvin's classmate. Melvin's neighbors also helped out.

Since Melvin was 8, he and his parents have given money to Cooper University Hospital every year. This year, Gary E. Stahl, the head of Cooper's division of neonatology (新生儿科), went to Melvin's school to accept the money.

The money goes to a part of the hospital that helps about 500 young patients every year. “When they leave, we call them graduates(毕业生),” Stahl said, “We are pleased when our graduates and their families do well, like Melvin and his family.”

根据短文内容，回答问题。

1. How old was Melvin when he started to do charity work?

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2. What caused(引起) Melvin to raise money for Cooper University Hospital?

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3. How often have Melvin and his parents given money to Cooper University Hospital?

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4. How many young patients get help every year?

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5.What can we learn from Melvin? ( 不超过7个单词)

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