Choose the best answer （选择最恰当的答案） 

Mike gets up at half past seven. He has an egg and some milk for breakfast. Then he goes to school. When he is on his way to school, he is thinking, "I tell my teacher that my mother is ill on Monday. I tell him my bike doesn't work on my way to school on Tuesday. What should I say today?" Mike thinks it over, but he doesn't have a good idea.

"May I come in?" says Mike at the door. "Oh, my boy," says Mr. Brown. "Please look at the clock on the wall. What time is it now?" "It's eight ten," says Mike. Mr. Brown is not happy. "You are late for class again this week. If all the students are like you, the clock is no use, I think."

"You are wrong, Mr. Brown," says Mike. "If I don't have the clock, how do I know I am late for school?"