补全对话，填入所缺词汇。

Alan : Hello, Bill.      1       do you often come to school?

Bill: I often come      2        a bus. What      3       you?

Alan: Oh, I usually come _   4       bike, but sometimes. I come      5       foot.

Bill:      6             7      is it from your home to school?

Alan: It's two kilometres.

Bill:      8            9       does it take?

Alan: It      10      me about 10 minutes on my bike and 20 minutes to walk.