根据句意和首字母完成下列句子

1. Don't stand o        . Come in please.    

2. Don't f       with each other.    

3. "No talking" is one of the library r      .    

4. Our school has a new dining h         . We all would like to eat there.

5.  If he doesn't want to do the job, does anybody e       want to do it?

局域网在逻辑上可以由网络服务器、工作站、网卡、（）和连接转换部件构成。

A.网络操作系统

B.传输介质

C.网络管理软件

D.网络应用软件