-What do you know about Vancouver?-It's host city of the 2010 Winter Olympic Games, and it is also ____ home to North America's second biggest Chinatown.
—What about __________ lecture yesterday? —Well,__________ most boring one indeed.
The doctor must be _______ 24 hours a day, 7 days a week in the boarding school.
What was considered impolite years ago has become ________now.
Which way do you enjoy _______ the coming winter holiday, staying home or going on a trip to Europe?
_______ worries the public a lot the way the students are getting more and more stressed out.