Ex 1. Circle the word that had a different underlined sound. 1. A. hydro B. oxygen C. cycle D. fly 2. A. biogas B. limited C. light D. carbon dioxide 3. A. available B. abundant C. safe D. solar 4. A. energy B. dangerous C. shortage D. hunger 5. A. heat B. clean C. break D. mean 6. A. panel B. place C. waste D. save Ex 2. Choose the word which has the main stress placed differently from the others. 1. A. excited B. interested C. confident D. memorable 2. A. organize B. decorate C. divorce D. promise 3. A. difficult B. relevant C. volunteer D. interesting 4. A. remember B. company C. technical D. interview 5. A. electric B. computer C. fascinate D. fantastic Ex 3. Fill in the blank with one suitable word from the box: hydro, heat, abundant, freely, renewable, friendly, turbines, solar, available, generate 1. How much power output will the new wind __________ increase? 2. Batteries of solar energy are eco- ________ products. 3. Renewable energy sources are favoured because they are ________. 4. In this area natural gas is not always ________. 5. ________ power is generated from the energy of fast running water. 6. Solar energy is ________, and solar power can be used to generate electricity. 7. My family will be receiving ________ panels for home tomorrow morning. 8. Fossil fuel burning produces ________ and carbon dioxide. GIÚP MÌNH VỚI Ạ~~PLS