——Why are the housing prices in big cities going up all the time?——One reason is that people are__________ into overcrowded cities in great numbers.
It is said _____has been translated into Chinese.
The meeting was long and the speakers said ____nothing worth listening to.
The Titanic, the biggest ship of its day, ____ unsinkable, but it sank on its first voyage in 1912.
We'd better get up earlier than usual if we want to catch the train, ____?
I once heard him ____ that a rainbow (彩虹) was a bridge from earth to heaven.