阅读下面短文，从短文后各题所给的A、B、C,D四个选项中，选出最佳的选项。

Tom did not like doing his homework, because he liked to do some1things after school. And his teacher always2a lot of mistakes(错误) in his homework.

Then one day, his Maths teacher3at Tom's homework and saw that he got all his answers right. He was very4and surprised(惊奇的).The next morning before class, he called Tom5his desk and6him," You got all your homework right this time. Did your father help you?" Sometimes 'Tom's father helped him with his homework,7this time he didn't help 'Tom because he8at home. So Tom answered," No, Sir. He was busy last night, so I9to do it10".