3. Universities in VN offer courses to help students improve analytical skills
4. Deforestation results in the rise of the temperature of the Earth
5. Deforestation is one of the biggest environmetal threats to the ecological balance of the world
6. It often takes three years to graduate college
7. Mary has done research project since last month
8. Having talked with environmetalist, we changed our attitude to nature
9. Global warming have severely impacted on water supplies , threatened food production and upset...
10. Global warming results from climate change and catastrophic weather patterns