重写句子：Fossilfuelsarenon-renewable.Weneedtofindalternativeenergysources.(compoundsentence)
Fossil fuels are non-renewable, so we need to find alternative energy sources.
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Havingdecidedtorentaflat,we________contactinghousingagenciesinthecity.
Veryfewpeopleunderstoodthiscontract,______wasveryobscure.