(二)Yesterday, my neighbor Mr. Chen visited my son’s school. He went there because my son Jack invited him to be a one-day coach at the school baseball camp. In fact, many students joined the camp because of him. They wanted to see Mr. Chen in person and learn skills from him. Why was that? Because Mr. Chen was a famous and popular MLB player five years ago. As a star player, he had great baseball skills, and his games were always exciting. I used to stay up watching his games even though I was tired after work. I was his big fan then. Now, he is still good at baseball, and we play together on weekends. Guess what! My son seldom exercised before, but now he plays baseball with us every weekend. He also joined the school baseball team last semester. I’m very happy about that. MLB 美國職業棒球大聯盟

4. What did Mr. Chen do five years ago?
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