Match the beginnings (1-5) with the endings (a-e) to make questions and sentences.

### Exercise 4. Match the beginnings (1–5) with the endings (a–e): 1. What will happen if we don't stop climate change? (1–d) 2. Unless we reduce carbon dioxide, the planet will get warmer. (2–b) 3. Many species of wildlife may vanish if we don't protect their habitats. (3–a) 4. If we find alternative energy sources, we can stop using fossil fuels. (4–c) ### Exercise 5. Complete the first conditional sentences: 1. If we **reduce** plastic in the oceans, we **will save** (or **can save**) sea turtles and other marine life. 2. Unless we **cut** down on fossil fuels, the planet **will become** more polluted. 3. If we **do not stop** (or **don't stop**) climate change, many species of animals **will be** in danger. 4. The rainforests **will disappear** if we **do not protect** (or **don't protect**) them. ### Exercise 6. Circle the correct options: 1. Unless we leave now, we **c) miss** the last bus. 2. If Peter **c) doesn't finish** his project, he will fail his exam. 3. What **c) will you do** if you win the first prize? 4. Max **a) might not pass** if he doesn't study harder.