根据短文内容回答问题。

　　Young people sometimes have problems with their minds．Some students become worried because they have to study very hard．They almost have no time to have a good rest．Even during the holidays, they can't relax themselves．Others have trouble getting on well with people like their parents and classmates．

　　Xu, a Junior 2 student from Hefei．didn't study well, and always did badly in exams．He became so worried about it that he cut his finger with a knife．

　　Another student, 14-year-old Yan from Guangzhou, was afraid of exams．When she looked at the exam papers, she couldn't think of anything to write on them．

　　A recent report says about 18％ of teens have mental(精神的)problems．Their troubles include being worried and very unhappy, and having problem in learning and getting on with people．

　　Many students who have problems don't go for advice or help．Some think they will look foolish if they go to see a doctor．Others don't want to talk about their secrets．

　　Experts give some advice to teens：

　　Talk to your parents or teachers often．

　　Take part in group activities and play sports．

　　Go to see a doctor if you feel unhappy or unwell．

1．What's the matter with some teens?

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2．Why did Xu cut his finger with a knife?

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3．According to the passage, what does the recent report say?

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4．Why don't the students who have problems go for advice or help?

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5．If someone feels unwell, what should he or she do then?

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