24.21Communication breakdown may happen due to cultural differences. (1 Điểm) A. failure B. barrier C. misunderstanding D. success 25.22. The forest fire raged for eight hours and some animals were badly injured or killed. (1 Điểm) A. broke out B. died down C. blazed D. started 26.23. He wanted to create a device that can transmit human voices. (1 Điểm) A. block B. carry C. address D. change 27.24. We will have to cut down on the amount of fuel we use if the price keeps going up. (1 Điểm) A. live on B. increase C. do without D. take advantage of 28.25. The world only has finite resources. Oil and gas won’t last forever. (1 Điểm) A. limited B. fixed C. unlimited D. unknown