Notallbirdscanfly,______doallbirdsbuildnests.
凤霞从1966年被迫离开舞台，后来又因病不能登台，至今已经14年之久。
重写句子：Alanpassedthetest.Alanhadstudiedhard.Alanhadunderstoodthematerial.(complexsentence)
Itisvitalthatthework_______intime.
Inthe1960spopmusicunderwentarevolutionwhen________becameworldfamousandturnedtheirhometownofLiverpoolintoaplaceofpilgrimage.
