It is well-known to us all that knowledge is __ treasure, but practice is ___ key to it.
There was a __________look on her face because a________ problem _________the little girl.
If you let pressure benefit ___________upset you, much more can be accomplished than you thought possible.
When he woke up,he found himself _________in bed and ________by some children.
With so much noise of the traffic, I couldn`t __________and do my research work.
New technologies have made __________easier to enjoy life than ever before.