根据句意填空，首字母已经给出。

1. When you want to post a letter,you need a s______.

2. You room is u______.You need to clear it up.

3. Edison was so c______that he invented a lot of things.

4. You have collected all different kind of dolls.We can say you have a big

    c______

5. Many students have h______such as reading,painting and so on.

对于单台OMC客户端，以下哪些带宽可以支撑其顺畅的接入服务器（）

A.512kbps

B.1Mbps

C.2Mbps

D.5Mbps