About one third of the population in Beijing and Shanghai ______ netizens, but in poorest areas, only three or four percent ______ online.
What’s the noise ? It sounds as if it comes from upstairs. –______. It must be the window-cleaner working , next door.
Common people always hold the view the experts say is right.
Exercising every day can help us stay healthy.
____ old man behind Mary is _____ university teacher.