What do you think of the EXPO 2010？— It’s great， of course. people are going to Shanghai for the EXPO 2010.

How did the accident happen?— You know, it difficult to see the road clearly because it .

We all think Liu yang is helpful girl. You can believe her.

We often eat potatoes____ picnic.[ ]

An earthquake happened in Sichuan _____ May 12, 2008. [ ]