根据短文内容，回答问题。 Dick is seven years old. He begins to go to school this term. He studies very hard and listens to the teachers carefully. He is polite (礼貌) and has lots of friends. So they all like him very much. It's Saturday today. Dick, his sister Kate and his mother stay at home. His mother is doing some housework and he is watching TV and the girl is doing her homework. At ten his father comes back from the farm with a bag of apples. The boy likes them very much and wants to eat some. His mother gives him four apples and says, 'Go to wash them in the kitchen.' Dick washes the apples and then gives them back to his mother. The woman says, 'Which apple do you want, Dick?' 'The biggest one, Mummy.' 'What?' says Dick's mother,'You should be polite and want the little one.' 'Should I tell a lie just to be polite, Mummy?' 1. At what age do children begin their schooling in Dick's country? _____________________________________________________________ 2. Is Dick's sister a student? _____________________________________________________________ 3. Why does the mother ask Dick to wash four apples _____________________________________________________________ 4. Who do you think may eat the biggest apple? _____________________________________________________________ 5. What's the meaning of 'just to be polite' in the last paragraph in Chinese? _____________________________________________________________