题目内容：

    Mr. Li is 79 years old this year, but he looks very young. Doing sports is his secret（秘密） to keeping young. He gets up early every morning. He does sports for about one hour after washing. On Monday, Tuesday and Wednesday, he plays football with some friends. And on Thursday, Friday and Saturday, he runs in a park near his house. He knows many people in the park, because he runs there for a long time.

Besides（另外）, Mr. Li likes collecting（收集） sports things. He has five basketballs and three footballs. But he doesn’t play basketball. He only watches it on TV. Mr. Li has three children, one son and two daughters. They all like doing sports. Sometimes, they do sports with their father. They are very happy at that time.

1.What is the secret for Mr, Li to keep young?

2.How many days does Mr. Li play football with his friends?

3.Where does Mr. Li run on Saturday?

4.Why does Mr. Li know many people when he runs?

5.Is playing basketball one of Mr. Li's hobbies（爱好）?