作业精灵老师示例：
1. David has some good habits. He always brushes his teeth in the morning
and before bedtime. He always waits for the green man when he is crossing
the road. He usually makes the bed after he gets up. He also has some bad habits.
He sometimes eats too much ice cream. He always eats meat and doesn't eat
vegetables. And he usually gets up late in the morning.
2. Penny has some good habits. She always likes reading. She listens to the
teachers carefully in class. She also has some bad habits. She usually keeps
her desk dirty. She sometimes eats too many cakes and drinks too much cola.
She always reads late in the evening so she goes to bed late and she always
runs to school. She sometimes reads in the crossing road. It is not safe.
