用所给词的适当形式填空。

1. This is an ______ (interest) place. Many people like it.

2. I don't think English is as ______ (difficult) as maths.

3. Can you hear the sound of children ______ (play) outside?

4.The people in the ship were enjoying ______ (them).

5. The ______ (thank) mother didn't know what to say.

在PC机中，各类存储器的速度由高到低的次序是（）。

A.主存、Cache、硬盘、软盘

B.硬盘、Cache、主存、软盘

C.Cache、硬盘、主存、软盘

D.Cache、主存、硬盘、软盘