4、n,could,beableto的适当形式填空1.Thoughthebuildingwasonfire,theywere able to gooutsafely.2.Itcan’tbethepostmanatthedoor.It’sonlysixo’clock.3.—How’syournewbabysitter?—Wecouldnotaskforabetterone.Allourkidslovehersomuch.4.Thepolicestillhaven’tfoundthelostchild,butthey’redoingal