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1) The children left the house,then the house collapsed ( before )
2)She suffered from a serious disease because of drinking comtaminated water in along time ( since)
3)The local goverment displayed many educational posters on the street to encuorage people to protect the environment(were )
2)She suffered from a serious disease because of drinking comtaminated water in along time ( since)
3)The local goverment displayed many educational posters on the street to encuorage people to protect the environment(were )