_______ about the universe up till now.
His parents died in the strong earthquake, so he was _____ in the SOS Village.
Because of the rain, we’ll have our P.E. class in the classroom _____ the playground.
A flag is _____ a piece of cloth. It stands for a nation’s people, their land and their history.
—_____ I invite Jack to the party? —Yes, it’ll be nice if you _____.
The couple _____ for thirty years.