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Here are the answers: 3. If we don't plant more trees, we will lose our oxygen. 4. Bella will harm the environment if she doesn't reuse her old items. 5. I will buy recycled bags if they don't cost much. 6. Wouldn't it be better if Carlos went to school by bus? 7. We will save more trees if we use paper economically. 8. If there were a flood, many people would lose their homes. 9. If he gave his old clothes to charity, he would help people in need. 10. Wild animals will die if people continue destroying their habitats. Here are the combined sentences using conditional sentence type 1: 1. If factories dump waste into rivers, a lot of fish die. 2. If people keep using plastic bags, oceans will be full of plastic garbage. 3. They won't save a lot of money if they go to work by taxi. 4. If people build too many houses, land for farming will decrease. 5. If the Earth becomes hotter, the polar ice cap will melt. 6. You will waste your paper if you don't write on both sides. 7. We won't harm the environment if we use recycled products. 8. If people breathe polluted air, they will suffer from lung diseases. 9. There will be too much air pollution in this area if the residents don't often cycle. 10. Those companies will receive good feedback if they produce reusable bags. Here are the best answers to complete the sentences: 1. A. the - the Sentence: I've finished the homework and I'm going to go to bed now. 2. B. carries Sentence: Daisy will become 'greener' if she carries a reusable shopping bag. 3. C. see Sentence: What will you do if you see someone throwing trash on the street?