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2.In the future, people will ________ ________ ________ (»îµ½) 200 years old.
3.There will be fewer trees and the environment will be ________ ________ ________ (´¦ÓÚ¼«´óµÄΣÏÕÖ®ÖÐ
4.Everyone should ________ ________ ________ (²ÎÓë) in saving the earth.
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If buildings ________________ with people ________£¬they will come soon.
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