根据短文内容回答问题，计5分。
Jack exercises every morning ， and he comes back home from school on foot every afternoon .he often says ，”It’s important to exercise .” So he is very healthy .he often eats fruit and vegetables ， because fruit and vegetables are healthy food and they can give him lots of energy .He seldom eats snacks ，biscuits cakes or some other sweet food ，because sweet food isn’t healthy .
Jack likes watching TV .He watches TV for over 4 hours every day .And he goes to sleep very late .he sleeps for 6 hours every night .It’s not enough .He knows that it isn’t good for his health .He plans to change it .
How does Jack come back home from school every afternoon ?
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What does Jack often eat ?
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why does Jack seldom eat biscuits ， cakes or other sweet food ?
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How long does Jack watch TV every day ?
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Does Jack have enough sleep every night ?
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