将下列句子改为感叹句。

1. It is a busy day. (how)

2. The weather is very bad. (what)

3. You cooked nice food. (how)

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4. The water here is very clean. (what)

5. This kind of car is too expensive. (how)

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与OSI参考模型一样，TCP（Transfer Control Protocol）/IP（Internet Protocol）协议（传输控制协议/网际协议）也分为七层。