1. What can we do under the aging(老化的)_______(人口) situation?
2. 70 _______ (百分之……) of Chinese women are satisfied with their lives.
3. The water level is _______ (上升；增长).
4. We take ten ________ (分钟)-walk exercise everyday.
5. He                    ________ (吸烟) for years before stopping.