John is the only one of the students in the class that never _______ a mistake even when it is pointed to him.
I have kept that portrait _____ I can see it every day, as it always reminds me of my university days in London.
The ability to store knowledge makes computers different from every other machine _____ invented.
_____ quite recently, most mothers in Britain did not take paid work outside the home.
I’ve already told you that I’m going to but it, _____.
You will want two trees about ten feet apart, from ______ to suspend your tent.