Have you ever been to___Great Hall of the People?
Whoever leaves the lab last, _____ all the lights are turned off.
Nobody can tell _____ the future world will look like.
— I put him down for a well-educated man. —______ ? — I mean that he's a well-educated man.
The silence of the library is sometimes broken by a sudden cough or the sound of pages______.
Wang Pin is an advanced worker in our company. He _______ for four years in Yangzhou University.