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D
Because they are high in fibre and low in fat.
Too much sweet food and too many soft drinks.
We will have stronger hearts.
At least nine hours.
How to keep healthy
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       To:Su Hai
       Subject:My habits 
       Dear Su Hai,
       I have some good habits. I usually brush my teeth in the morning and before bedtime. I always put my things in order and help my parents do housework at home. I often listen to my teachers carefully in class. I usually help my classmates with their study. But I have some bad habits too. Sometimes I finish my homework late and don't go to bed early at night. Then, I'll feel sleepy the next morning. What are your habits? Please share with me. 
                                                                       Love,
                                                                       Anna