The school board has teachers to spare no effort to help the students who have fallen behind in studies.
He tried hard to keep calm in face of the policemen, but the sweat on his forehead _________.
I’m moving to the countryside because the air there is much fresher than _______ in the city.
We are invited to a party __________in our club next Friday.
By the time Jack returned home from England, his son __________from college.
It suddenly __________ to the detective that the millionaire was probably murdered by his own daughter.