He's late, __is often the case. 

—________you like that latest type of car so much，why not buy it?—Well，I can’t afford so expensive a car. It is worth 200,000 yuan.

_________ is known to us all is that the 2012 Olympic Games will take place in London.

Here _____. This is our classroom.

I ______along the street looking for a place to park when the accident______ .