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.

1. The chemical factory p__________ terrible gas every day.
2. If you b__________ some fresh air, you will feel better.
3. Don't d__________ me now. I'm doing my homework.
4. As we know, n___________ of us likes pollution.
5. You shouldn't throw r___________ here and there.
6. We should do everything we can to protect the e___________.
7. Everyone is s__________ to do something useful.
8. Trees can p__________ the sand from moving towards the rich land.
9. You'd better take a taxi i__________ of walking there. Because it's a long way.
10. We really need to collect w__________ paper and soft drink cans.