No. 1 Middle School of Anxiang is the very place ______ Song Zhenyu, the Provincial science top of Hunan in 2014, was studying.
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.