1. If we waste paper, we will save a lot of trees. A.repeat B.recycle C.rewrite D.remake 2. If we plant more trees inthe schoolyard, the school will become a place. A.greener B. darker C. dirtier D.more polluted 3. "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 4. "What can we do air pollution?" A.reduce B.to reduce C.reducing D.to reducing 5. You can save money while shopping by only buying you need. A. what B. it C. this D. that 6. "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 7. Please collect all the recyclable materials, and take them to the factory. A.recycle B.recycled C. recyclable D.recycling 8. This newspaper is made of paper. A.recycle B.recycled C.old D.waste 9. If we all use bags, we'll help the environment. A.new B.cheap C.reusable D.reduced 10. These three Rs . reduce, reuse, and recycle A.stand up B.stand for C.ask for D.means 11. If there is a rubbish bin in every class, the classroom will become . A. harmful B. lighter C. dirtier D. cleaner 12. "Don't throw rubbish into the river because you will make it ." A. greener B. dirty C. cleaner D. fresher 13. If we use paper, we will save a lot of trees. A.fewer B.less C.more D.much 14. You should put the food in a reusable box plastic bag. A. by B.instead of C.because of D.without 15. 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 16. It is a good idea to our clothes with our friends or cousins. A.change B.swap C.turn D.send 17. 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 18. If you have old clothes, will you give them to those ? A.needs B.to need C.for needing D.in need 19. My brother and I will give last year's clothes to instead of throwing them away. A.shop B.people C.charity D survey. 20. "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