It was from May 1 to October 31,2010____________the World Expo 2010 Shanghai will be held, _____________is a great event for the Chinese people

We’ll talk about some cases_______ driversobviously knew the traffic rules but didn’t obey them.

It’s 3 o’clock in the morning, but I’m still wide __________.

I think that ____ very difficult to learn.

Mike is kind，determined and full of energy.________，I can’t speak too highly of him.