The first World Cities Day of the UN, _______on Oct.31, 2014 in Shanghai, focused on leading urban transformation.
In December 2008, Obama was _________________.
Sometimes children are _______ enough to create ______ stories.
The professor _______ to walk out of the office when one of his students came in.
Look, the little girl is dancing as if she ______ a little bird.
The teacher told me that the earth _______ round.