1. My classmates participated in the green movement in 2016 and 2017 (twice) => My 2. The increasing use of chemical fertilisers on croplands leads to global warming => Global warming results 3. Since the local residents had been explained about the risks of greenhouse effect, they joined hands to help preserve environment => 4. As I had not done my homework, I failed the exam => 5. She said that she would take responsibility for the project. But then she denied that => Mong mn giúp đỡ.