Do you know the reason ________he was late for the class?
Though I ____ to go abroad, I changed my mind and decided to stay with my family.
The president stood by a window inside the room, ____, looking over the square.
As time went by, the plan stuck ____ fairly practical.
It was believed that things would get worse, but ____ it is they are getting better.
The students spent as much time getting trained as they ____ studying.