—The air is full of smoke and people are coughing.—It will get worse________the government does something about the pollution.
The open university was started in order to help those who _____ having a university education when they were young.
He has left his book here on _____, so that you can read it.
I remember her face but I cannot _____ where I met her.
The climbers _____ their ambition by reaching the summit of the mountain.
It has always been the _____ of our firm to encourage workers to take part in social activities.