He refused to ___ to the terrible weather only at the last moment because he had no choice.
Little Jim is going to spend his holiday in Paris, _____ lives his uncle.
The problem is not _____ easy. Think _____ over.
It is so difficult a problem that _____ student in this class _____ work it out.
I think he is _____ to win, but I'm not sure.
They own two cars, not to _____ a motorbike.