The expo is being held in Shanghai, _______a lot of advanced technology is shown for the first time.
I will explain to them _______ we are planning to do on Sunday.
My pen-friend,Peter,wrote to me,expressing the hope _______ he would come to Beijing to see the 2008 Olympic Games.
It was not until dark _______ he found _______ he thought was the correct way to solve the problem.
They lost their way in the forest, and _______ made matters worse was that night began to fall.
They are teachers and don’t realize _______ to start and run a company.