— I’m sorry you have missed the bus. It _____ five minutes ago. — What a pity!
There is ________ in the classroom, so we can see ________.
We should prevent the children ________ the bad programmes.
The Olympics ________ every four years. And the 29th Olympics ________ in Beijing in 2008.
I think ________ necessary ________ to take more exercise.
A football match ________ in our school next Monday.