The story _____ three years ago.

ill you start your work after graduation—Mmm,it’s not been decided yet I ______ continue my study for a higher degree

It was at 5 o’clock __________ the visitors finally arrived at Pudong International Airport.

There are about _________ students in our school and about ________ of them are girls.

Has Nancy gone back to her home in the UK–Yes. She ______ here only for three days with her friends.