1. People don't care much about environment, so they keep making it worse. => If people.... 2. She suffered from a serious disease because of drinking contaminated water in a long time. => Since... 3. The drainage system is damaged. There is not enough water for the crop. => If the drainage system... 4. "Why don't you turn off more lights in the house to reduce your eyestrain?" => If I... 5. The improvements of the public transport system will encourage more people to use it. => If...