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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1. How busy a day it is!
2. What bad weather it is!
3. How nice the food you cooked is!
4. What clean water it is here!
5. How expensive this kind of car is!