If you _____ the medicine you _____ better now.
We have done things we ought not to have done and ________ undone things we ought to have done.
Paper produced every year is ________ the world’s production of vehicles.
The two ladies are ________ the same age, but there seems to be ten years ________ them.
I planned ________ to see you last week, but I was ill.
While building a tunnel through the mountain, ________ .