Don’t get off the bus __________ it stops.
Betty had nothing to do last Sunday afternoon, ____________?
How time flies! Ten years _______ really a short time.
--The twin sisters look the same.--I think so. Even their parents call them ____________.
The best tickets for LiYundi’s concert on May Day ____________ more than 2,000 RMB
You should ____________ your hands if you have any problems.