单词拼写：根据句意和所给首字母提示完成句中所缺单词。
1. We've made great p__________ in solving the problem of air pollution recently.
2. All parents hope their children can receive the best e__________.
3. My e__________ sister is three years older than me.
4. You need a lot of t__________ in listening, speaking, reading and writing if you want to improve your English.
5. With the d__________ of our society, our life is getting better and better.
6. Who can describe the changes in d__________ that have taken place in our city?
7. U_________ anyone has anything else to say, the meeting is closed.
8. I don't go to play much n__________ because I'm too busy.
9. It is important that we should be f__________ with each other.
