阅读下面短文，从各题所给的A、B、C、D四个选项中选出能填入文章中相应空白处的最佳答案。

    David is 1 American school boy. His school is not 2 from his home. It takes him only ten 3 to go to school by bus. But he's often late for school because he can't get up 4. It's a 5 day today. David gets up early. He has breakfast and goes to school. He 6 to the bus station. He takes a bus 7 seven o'clock. His classes begin at half past seven. But today he is 8 late. Do you know 9? Because he takes a 10 bus!