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Exercise 4. Complete the sentences with the words given.
1. The wind energy is cheap and readily **available** during summer in our region.
2. If the fan doesn't work, the engine could **overheat**.
3. Solar **panels** are put on the roofs to produce electricity.
4. We **recycle** all our cans and bottles.
5. The **hydro energy** program will provide energy for 100,000 homes.
6. Batteries store **energy** from the solar panels.
7. All countries are asked to reduce their use of **non-renewable** sources of energy.
8. We would like people use more renewable energy sources instead of **fossil fuels**.
9. We should use less gas, but increase the use of **nuclear energy**.
10. His new job is to make sure lights and electrical **appliances** are switched off when they are not used.

Exercise 5. Choose the correct words.
1. We should rely much more on **limited / expensive / alternative** sources of energy.
2. The river provides a **limited / plentiful / polluting** supply of clean water to nearby villages - they don't worry about water supply any more.
3. The problem with fossil fuels is that they are not **non-renewable / renewable / dangerous**.
4. The public have more concerns about **water / nuclear / solar** energy because of waste and accidents.
5. He seems not to **run up / run away / run out** of energy, so he can work for hours nonstop.
6. Strawberries are **plentiful / limited / renewable** and cheap in summer.
7. Our harmful / **available / nuclear** natural resources will run out soon.
8. The sun can make our energy the **cheap / unlimited / clean**.
9. Solar energy seems to be harmful / **unlimited / clean** - we can rely on it for a factory.
10. The air becomes worse because of **polluted / polluting/pollution** gases from the factory.