25. The train leaves at 6:00 p.m., so I have to be at the station ____ 5:40 p.m. at the least.
October 1,1949 is the day_________ the People’s Republic of China was founded.
Is this school________ I visited last year?
Is there anything ________ I can do for you?
Father asked Anne_______________________.
The teacher said that ____________________.