When and where theaccident —It happened on the street yesterday.

I got a letter this afternoon. It was ____my foreign friend.

oice of China has set up a big stage for young people with a talent for music, ________ some of them have stood out among others

It was announced that only when the fire was under control ____to return to their homes. [ ]

On April 20,2013, a serious earthquake happened in Ya’an. Many people a in it.