题目内容：

    At the age of 16, Einstein always played with a group of crazy kids. Because he was so busy playing, he didn’t study enough and failed his final exam.

One morning, when Einstein was holding a fishing tool and was about to go fishing with his friends, his father stopped him and said seriously, “Einstein, you’re so crazy about playing that you failed your exam. I’m worried about your future.”

“What are you worrying about? Jack and Robert also failed, but don’t they still get to go fishing?”

“My boy, you can’t think like that,” his dad said. “There is a story that people tell in our hometown. Listen to it now.”

“There were two cats playing on the top of a house. One cat was careless and fell down the chimney(烟囱) while holding the other cat. When the two cats climbed out of the chimney, one of the cats had soot(烟灰) on his face, while the other cat’s face was clean. Seeing the soot-faced cat, the clean cat thought its face must be dirty, so it quickly ran to the riverside and washed its face. The soot-faced cat saw the clean-faced cat and thought its face was also clean, so it just walked down the street happily.”

“Einstein, no one can be your ‘mirror’. You have to think for yourself. If you follow others, you will never learn.”

Hearing this, Einstein laid down his fishing tool and returned to his room. He studied hard and didn’t follow others from then on. This allowed him to be successful.

So, what kind of people do you usually hang out with? Do they study a lot or do they just want to play all the time? Don’t blindly follow others.

根据短文内容，回答下列问题。

1.Who did Einstein always play with when he was 16?

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2.Why did Einstein’s father worry about Einstein’s future?

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3.Where did one of the cats clean its face?

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4.How did Einstein become successful?

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5.What does the passage want to tell us?

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