_____ is no doubt ______ you have to remain seated and fasten your seatbelt before the plane lands.
Daddy promised me he ______ me a computer A. was bought B. had bought C bought D. would buy
They said they ______ do some sports if it was fine.
He ______ in Shanghai University for four years before he ______ Beijing.
Mary said it was at least five years since he ______ a good drink.
Xiao Pei said she ______ Hainan for 3 months.