Choose the word/ phrase/ sentence (A, B, C, or D) that best fits the space in each sentences or best answers the question. 1. We should ______ our carbon footprint to protect the environment. A. pollute B. protect C. reduce D. endanger 2. You should turn off devices that you are not using to ______ electricity. A. save B. reuse C. release D. turn 3. "Carbon footprint" is the amount of carbon dioxide that we ______ into the environment. A. stop B. plant C. recycle D. release 4. People shouldn't throw away single-use products but ______ them. A. endanger B. recycle C. protect D. pollute 5. They can ______ campfires on the beach near the hotel. A. volunteer B. cut C. build D. litter 6. The people in my village often ______ down trees to build houses. A. cut B. pollute C. avoid D. release 7. You shouldn't dump the rubbish into the river to reduce ________ pollution A. air B. water C. carbon D. campfire 8. Forests help release oxygen and absorb __________________ A. carbon dioxide B. global warming C. environmental protection D. water pollution 9. We can take part in activities like picking ______ and planting trees to protect nature and the environment. A. up B. about C. down D. to 10. A number of cleaning products contain ______ chemicals A. safeful B. helpful C. harmful D. hopeful