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Directions：Read the following passage．Fill in the numbered blanks by using the information from the passage．Write NO MORE THAN THREE WORDS for each answer．
With more than 12, 500 plastic bottles being discarded(丢弃)every eight seconds, environmentalists are trying to come up with new innovative uses for this artificial(man－made)waste that is rapidly filling our landfills(垃圾填埋地)and harming our marine life．
Now, some developing nations are finding a new use for discarded bottles－building much－needed schools．A Central American organization called Pura Vida was the first to come up with this innovative idea．Instead of using building bricks, they filled plastic bottles with rubbish and built walls by piling them up between steel wires．The resulting structure was not only eco－friendly and cheap, but also as strong as a structure built using normal materials．
The project, which cost only US＄ 5, 181, was so successful that it had led to the establishment of a non－profit organization, Bottle Schools, which, with the support of San Diego－based Hug It Forward, has built five additional schools in Guatemala and has two more in the works．
Taking the hint from Bottle Schools is the My Shelter Foundation, which, under the leadership of Lilac Diaz, has started similar projects in Asia．Built on land donated by the government, the San Pablo, a Philippine school, was also built by volunteers and with “donations” of plastic bottles by the locals．However, unlike the other bottle schools, these bottles are filled with liquefied adobe(液化土坯)，which is three times stronger than concrete, and they are reinforced with steel bars．The school is also a lot more stylish than the previous ones, thanks to the different colors of the bottles and the open－air design．The best part is that this is just one of many such schools that will be built throughout the country．This kind of structure would be a great idea for developing countries around the world．And because it is good for the environment, perhaps it would also be a good way to celebrate Earth Day．
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