--I’m sorry I made a mistake!---________. Nobody is perfect.
A good idea __________ to me, and I quickly picked up the phone to tell Jack about it.
So suddenly __________ that people had no time to escape.
I happened __________ with him when he was hit by a stone.
You'd better not phone me between two and six o'clock this afternoon; I __________ a speech then.
By the middle of the 21st century, the vast majority of the world's population __________ in cities rather than in the country.