—Which city has______population,Beijing,Guiyang or Xingyi?—Beijing, of course.
—Did you know ______ just now? —Their plane didn't take off on time because of the thick fog.
—Excuse me, could you tell me ______? —Sorry, I don’t know. I’m new here.
---Who can tell me_______? ---Every 15 minutes.
The newly-designed car is on show now. I wonder .
---What did the policeman say to you just now? --- He asked _______ when the accident happened.