5. I think my long and active life must be due to the healthy life I live.

我想我之所以长寿而且精力充沛，要归功于我的健康生活。

4. It’s amazing that at my age I am still fit enough to cycle 20 kilometers in an afternoon.

感到惊奇吧，向我这样的年纪，身体健康，能在一个下午骑车跑20公里。

17.every time 每次；每当……时

16.prevent sb. (from) doing sth. 阻止某人做某事

15.make sure 确定；查明；弄明白

14.so far 到目前为止(与现在完成时连用)

13.manage to do sth. 设法做好/设法办到某事

12.at risk 处在危险之中

take risks(a risk)　 冒险

11.quit (doing) sth. 停止做某事

10.take off　 开除/脱衣/起飞/取消/休假