Bob is a good boy. He gets up at 6: 00 in the morning. Before breakfast, he washes his hands and face, and brushes his teeth. After breakfast, he goes to school on foot. He has four classes in the morning and two in the afternoon. Then he goes home. At home, he often does his homework. Then he reads a book and goes to bed.
| A．Twice a day. |
| B．I think you need about an hour of exercise a day, Linda! |
| C．How often do you exercise, Linda? |
| D．How many minutes do you exercise? |
| E．About ten minutes. |
| F．Okay. I'm going to exercise an hour a day. |
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