30._______ I know about this competition is that it is held every two years.
—George, the poor guy, has just bought a big house! Are you joking? —No. ______.
The country life we ______. The differences between rural and urban areas are disappearing.
The boy likes to play tricks ____ girls, and his parents should cure him ______ that bad habit.
Many of them turned a deaf ear to his advice ______ they knew it to be valuable.
The discovery of new evidence led to ________.