She may have missed the train, in _____ case she won't arrive for another hour.
I a report about the air pollution in my hometown all the morning and haven’t finished it yet.
It is I who going to have a trip to New York this summer.
I am determined to get a ticket for the concert it means standing in a line all night.
You have seen Helen in her office this morning because she’s been out of town for two weeks.
in 1898, Beijing University is one of the top universities in China.