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Unit3IHaveSeenAmazingThings9.metalribbons(14)10.isdisposedof(18)11.theprinciplesofecology(18)12.greedyadj.(19)13.severalgradesofusefulmaterial(19-20)14.“fertilizer”forthefield(20)FastreadingWhat’sthewriter’sfirstvisit?Andhowdiditwork?Amazingstop1thoughtpadAmazingstop2awastemachineawastemachineawastemachineAmazingstop3manufacturingrobotsWhileIwasobservingthemthepathmoveduson.WhilewatchingTV__________.thedoorbellring.thedooropened.weheardthedoorbellrang.weheardthedoorbellring.1.Insidewasanexhibitionofthemostup-to-dateinventionsofthe31stcentury.
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