重写句子：Fossilfuelsarenon-renewable.Weneedtofindalternativeenergysources.(compoundsentence)
Itwasnotuntilshehadfinishedallherwork_____.
I'dliketoremindyouthatthereisno_____onthepartofsuspectstoanswerquestions.
Ifyou_______inbehavinginthiswayyouwillbringyourselfnothingbuttrouble.
Whatarethekeyfeaturesofaresearchpaper?
