​1. I am afraid that the air polution in our city is getting worse and worse.
2. We are sure that environmental pollution will be controlled.
3. If the sea level rises, there will be floods in many parts of the world.
4. If many people lose their homes and land, they will live in hunger and poverty.
5. Why are many countries spending much more time and money doing research on energy from the sun, the waves and the wind?
6. We can save natural resources by using solar energy instead of fossil fuels.
7. We can use the Internet as an effective way for self - study.
8. In Paris, he met many friends who encouraged him in his writing career.
9. We shouldn t swim in this river because its water is highly polluted. 
10. Although he has a very important job, he isn't particulaly well-paid.