重写句子：Fossilfuelsarenon-renewable.Weneedtofindalternativeenergysources.(compoundsentence)

重写句子：Weslippedontheroadwhenwecouldseenolightsintheheavyrainthatnight.(periodicsentence)

Manypatientsinsistonhavingwatcheswiththeminhospital,______theyhavenoschedulestokeep.

Australia,whichisoneoftheworld'sdevelopedcountries,hasbecomerichthrough________.

根据对患者人身造成的损害程度，医疗事故分为______