小圆的半径是2厘米，大圆的直径是3厘米，大圆和小圆的直径比是____，大圆和小圆的周长比是____。

根据首字母提示完成下列短文。

    A good class monitor gets on well w____ classmates and likes to h____ others. He often cleans the classroom and makes the classroom c____ just like h____. C____ him to be your monitor.