在网络结构的最低层(物理层)，直接相连的两台机器之间的信息交换体现为()。

区分“语言”和“言语”的主要目的是（）

You ________ go now. It ’s getting late.

I found ________ to answer all the questions within the time given.

互联网起源于()。

Only when you have obtained sufficient data ________ come to a sound conclusion.

I wish you ________ like that.

Hardly had he finished his speech ________ the audience started cheering.

I have been studying here for four years, by next summer I ________.

I prefer this diagram ________ that one.