Once there was ______time _____people walked without shoes.
Ever since MaYun founded Taobao Website, the number of people shopping online ___quickly.
As the saying goes, “Only _____ to stop, can we smell the rose on the way.”
My sister’s flight______ and I want to see her off at the airport.
Mom called me and asked if I__________ .
Mandela met a lot of difficulties, he still fought for the equal rights of his people.