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.