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If people can wastes, they will save a lot of money. A.reuse B.reduce C.rebuild D.use ______new technology, we now have super smart TVs, smart phones. A.Because B.Because of C.Thanks D.Thanks to Robots will do most of the housework, ______we will have more time for our family. A.so B.but C.although D.if We should have recycling bins in each classroom for _____things. A.use B.reuse C.reused D.reusable If we plant more trees, the _____will be greener. A.neighbour B.soil C.air D.neighbourhood All of the machines will have a special card _____. A.start B.to start C.starting D.to starting If we _____all the trees, there will be no more oxygen for us to breathe. A.cuts B.cut off C.cutting D.cut down We should open all the windows, so we don’t _____use air-conditioners. A.have B.have to C.needn’t D.need Plant more trees in the schoolyard because they will provide shade and _____the atmosphere fresher. A.do B.make C.have D.use Our dream house will use only solar energy so that we can make the _____clean and green. A.nature B.environment C.kitchen D.home Many products are now helping you _____your energy bills. A.reduce B.reuse C.recycle D.cut down It takes a lot of energy to keep food cool, so don’t ____the fridge door open or putting hot things inside. A.make B.have C.leave D.stop Future houses will have hi-tech _____rooms for all of the family members. A.read B.to read C.reading D.to reading Our houses will use the sun or the wind ____electricity. A.to have B.to do C.to make D.to give In the future, cars might use energy from ____. A.gas B.water C.oil D.power Our dream house will be located ____the sea. A. on B. at C. in D.between 22. Don’t ____old things because perhaps you will need them later. A. throw B. throw away C. throwing D.throwing away 23. _____causes many breathing problems. A. Fresh air B. Fresher air C. Polluting air D.Polluted air 24. We won’t use CD players because we will have smart watches that _____music. A. play B. plays C. hear D. listen to 25. If you eat ______fast food, you will be fatter easily. A. very B. very much C. too much D. most III.Complete the first conditional sentences. If we stay at home, we (miss) _____the show. We (ask) _____about it, if you want. If he (want) ____it, we’ll buy it. If it (not/ work) _____, we’ll take it back. They (not/ go) _____on holiday this year, if their friends come to see them. You will be tired tomorrow if you (not/ go) _____to bed early. (the boys/ wear) _____their new T-shirts tomorrow if it is sunny? The cake (burn) ____if he doesn’t turn off the oven. We won’t go to the beach tomorrow if it (rain) ____. Will you walk to school if the bus (not/ come) _____soon? IV. Fill in each blank with ONE suitable word. 36. Soil pollution can make ____die. 37. What do these three Rs _____for? 38. If we all use this kind of bag, we’ll help to protect the ______. 39. We should find _____ways to reuse our old items before throwing them away. 40. If the river is not______ ,there will be more fish.

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