Complete each sentence with the word in bracket

complete each sentence with the word in bracket
*She's never baked a cake before.FIRST
It's...baked cake.
*when did you order the book? SINCE
How long...ordered the book?
*When did he start his training course?AGO
How long...his training course?
*She started learning Japanese six months ago.BEEN
She...for six months
*They haven't finished playing the game yet.STILL
They... the game.
*We didn't start eating until all the people had arrived.BEFORE
We waited untill all the people...eating.
*When did you last see Christopher?SINCE
How long is it... Christopher?