It is a pity that none of the ______ stopped ______ the poor man lying there, begging. 

Desipt the fact that there was a big ______ over the meeting, it seemed that a good many of the invited guests would still attend it.  

Finding information in today’s world is easy. The ______ is how you can tell if the information you get is useful or not.

In public places, we can often see ______ that tell us useful things, such as no parking, no smoking, etc.

Classification is a useful ______ to the organization of knowledge in any field.