I. Rewrite the following sentences based on the given words. 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____________________________________________________________