Just a month before the earthquake the school practiced an emergency drill showing the children how to ________ find their “safe place”．

(2013·安徽蚌埠第一次质检)Finding information in today's world is easy. The ________ is how you can tell if the information you get is useful or not.

 Some people are good at _____ voices on the phone while others ______.  

— Why not buy a second-hand car first if you don't have enough money for a new one?— That's a good        .

_______ is known to us all that the old scientist, for _______ life was hard in the past, still works hard in his eighties.