根据句子意思和所给单词的首字母进行填空(可适当改变单词形式)。
1. Tibet is in the w____ of China.
2. The boy work out the difficult problem. How s____ he is!
3. Hangzhou is so beautiful. You can see small bridges, blue water and green h____.
4. If you make your room dirty again, your mum will be a____.
5. Can you ride a h____?