People in Britain say “football” while people in the USA say ____.

“Why did you go to the wrong class, Mr. Wang ” “Well, I forget _______ I was supposed to go to.”

More and more high-rise buildings have been built in big cities _____space[ ]

It’s the sort of work that _______ a high level of patience. [ ]

As the girl in our class, Mary was chosen to take part in the running race.