阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。

Going to Mount Huangshan reminds me of the popular Beatles’ song “The Long and Winding Road”. What is so breathtaking about the experience is the out-of-this-world scenes. The rolling sea of clouds you see once you are at the top will remind you how tiny we 【小题1】 (human) are.

The hot spring at the foot of the mountain is something 【小题2】 you must try after the climb. It will 【小题3】 (undoubted) help you get refreshed! The amazing thing about the spring is that the colder the temperature gets, the 【小题4】 (hot) the spring! Strange, isn’t it? But that’s how nature is — always leaving us 【小题5】 (astonish).

What comes next is the endless series of steps. You can’t help wondering how hard it 【小题6】 (be) for the people at that time to put all those rocks into place. Though it is the only unnatural thing on your way up the mountain, still it highlights the whole adventure and it offers a place 【小题7】 you can sit down to rest your 【小题8】 (ache) legs.

As the song goes, this long and winding road “will never disappear”, and it will always stick in the visitor’s memory. It sure does in 【小题9】 (I). While you’re in China, Mount Huangshan is 【小题10】 must to visit!