重写句子：Fossilfuelsarenon-renewable.Weneedtofindalternativeenergysources.(compoundsentence)
Fossil fuels are non-renewable, so we need to find alternative energy sources.
暂无解析
Itmakesgood________tobringanumbrella;itseemstoberainingtoday.
重写句子：Theteacherreturnedthehomework.Theteachernoticedtheerror.(complexsentence)
Sicknessoften_______eatingtoomuch.
重写句子：Alanpassedthetest.Alanhadstudiedhard.Alanhadunderstoodthematerial.(complexsentence)