一个圆柱体，底面直径和高都是6厘米，它的侧面积是______平方厘米，体积是______立方厘米．

——Do you know where David is? I couldn’t find him anywhere.

——Well, he_______ gone far—his coat’s still here.

A．shouldn’t have

B．mustn’t have

C．can’t have

D．wouldn’t have