根据句意及首字母提示，在空白处填入适当的单词。
1. W________ is the post office? I can't find it.
2. This hat is too big. Can you give me a s_________ one.
3. The room in this hotel is very d_________. I want to change (换) a new one.
4. Go d_________ the street, you will see the library on your left.
5. T_________ is a clean park near our school.
