—Have you ever been to Shanghai, Mary?—Yes. I ______ there for three days with my parents last year.
——I haven't got a camera. ——I think you should buy_______. It's useful for you.
——Don’t put the bike_______the teaching building. ——Sorry, I won’t.
_____ people in the world are sending are receiving e-mails every day.
I have never heard______.
The traffic accident _____ last Sunday morning.