33.Only after he had spent several nights working on the math problem_______to wonder whether the problem was wrongly set.
The great chance he has been looking forward to _______ at last.
When ______ with any difficulty, you should not give up easily.
As soon as I joined the big crowd yesterday, I got _______ from my friends.
______ life pace continues to speed up, we seem to be losing the art of enjoyment.
I can hardly imagine ______ little children can work out the problem in _____ short a time.