Dark glasses are sometimes worn to ________the eyes from strong sunlight.

Nearly all educators believe that a challenging situation can often _______ the best qualities of a person. 

As this is a very casual get-together, you can tell them to ______ however they feel like to.

You should get your ideas ________ when you are putting _______ an ad campaign.

The beggar has no money with which to buy food. However, no passers-by ______ him.