1.Air pollution is a serious problem on the world. It's very harmful for our healthy and animals. To reduce air pollution,  we should use public transports, grow more trees and throw the rubbish into the right bin. 

2. English is getting popular on the world. It's spoken in many countries. Nowadays, students learn English at their school. When we learn it,  we can understand what the foreigner say and can communicate with them. 

3. Science technology is becoming popular in our life. It's very helpful for us to live easily. And communication is faster and cheaper. If you want to buy something, you can go shopping on the internet. Our life is easier and comfortable.