London held the first World Expo ( in 1851.),对括号里内容提问
问题描述：
London held the first World Expo ( in 1851.),对括号里内容提问
Alice cread the lovable cartoon in 2006.(改为被动语态)
答
When did London hold the first World Expo?
The lovable carton was created by Alice in 2006.