1 . Tai chi, part of Chinese culture, is a kind of exercise which helps people improve _______________ (they) in health. (所给词的适当形式填空)

2 . 阅读下面材料，在空白处填入适当的内容（1个单词）或括号内单词的正确形式。
I was nine years old when I learnt to ride a bike. The bike was a birthday present from my uncle. You can imagine how _(excite) I was when I saw the bike, and I begged my uncle to teach me how ________ (ride) it right away. However, before I got on the bike, I felt _________ (extreme) nervous and I was afraid that I would fall off and hurt _________ (me). My uncle held onto the seat and helped me to get _______ the bike. While I was riding, he was running along beside me, holding the seat so I would not fall over. I was so _________ (grate) to him for his help.
As I was practicing, I became more and more confident. Then, I heard my uncle shouting, “You are riding it by yourself now!” I was both excited and scared. I was really riding by myself, but _________ if I fell off? As I was wondering about this, my uncle ran after me and got hold of the bike. I _______ (slow) down and came to a stop. My heart was still beating fast when I got off the bike. ________ (late) that day, I felt like I was walking on air! I am still thankful to my uncle for teaching me to ride ________ bike on my ninth birthday.