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IV. Choose the best answer (A, B, C or D). 1. If we __________________ waste paper, we will save a lot of trees. A. Repeat B. Recycle C. Rewrite D. Remark 2. You can save money while shopping by only buying __________________ you need. A. What B. This C. It D. That 3. What can we do __________________ air pollution? A. Reduce B. To reduce C. Reducing D. To reducing 4. Why do you often forget to __________________ the lights when you go out of the classroom? A. Turn on B. Turn off C. Close D. Shut down 5. If we plant more trees in the schoolyard, the school will become a __________________ place. A. Darker B. Greener C. Dirtier D. More polluted 6. Do you think we should put a __________________ bin in every classroom in order to keep it clean? A. Reusable B. Recycled C. Recycling D. Recyclable 7. My brother and I will give last year’s clothes to __________________ instead of throwing them away. A. Shop B. People C. Charity D. Survey 8. Next week our class is having a discussion about finding __________________ ways to reuse old items before throwing them away. A. Interested B. Surprising C. Useless D. Creative 9. It is a good idea to __________________ our clothes with our friends or cousins. A. Change B. Swap C. Turn D. Send 10. If people turn off all electric appliances in one hour all over the world, they can save lots of _________. A. Electric B. Electrical C. Electrician D. electricity 11. You should put the food in a reusable box __________________ plastic bags. A. By B. Instead of C. Because of D. Without 12. If we use _________________ paper, we will save a lot of trees. A. Fewer B. Less C. More D. Much 13. Don’t throw rubbish into the river because you will make it __________________. A. Greener B. Dirty C. Cleaner D. Fresher 14. If there is a rubbish bin in every class, the classroom will become__________________. A. Harmful B. Lighter C. Dirtier D. Cleaner 15. If we all use __________________ bags, we will help the environment. A. New B. Cheap C. Reusable D. Reduced 16. This newspaper is made of __________________ paper. A. Recycle B. Recycled C. Old D. Waste 17. Please collect all the recyclable materials, and take them to the __________________ factory. A. Recycle B. Recycled C. Recyclable D. Recycling 18. Reduce, reuse, recycle is said to encourage people to waste less, by using less and using things again, in order to __________________ the environment. A. Harm B. Damage C. Pollute D. Protect 19. These three Rs __________________ reduce, reuse and recycle. A. Stand up B. Stand for C. Ask for D. Means 20. If you have old clothes, will you give them to those __________________? A. Needs B. To need C. For needing D. In need