---Mum, May I go out to play?---Sure, If your homework ______, you may go out to play.
The2014 Winter Olympics started ______ February7,2014.
Where’s Dad? Mum is looking for ______.
I didn’t know ______ last year.
The city walls _______ forty years ago. What a pity!
My classmate, Ann, ________ five Oxford Bookworm novels already.