We have done things we ought not to have done and ________ undone things we ought to have done.
The police officers in our city work hard __________ the rest of us can live a safe life.
Surely it doesn't matter who has donated the money to the organization; what __________ is what they do with it.
We appeal to all countries to __________ cooperation on climate change, food security and the prevention of natural disasters.
Only by increasing the number of doctors by 50 percent __________ properly in this hospital.
At school, it is essential that every child __________ equally regardless of family background.