Small ______ you are called early bird --- you always catch the first train to work!

As a result of destroying the forests, a large ________ of desert ________ covered the land.

The more _____ you listen to the tape, the _____ you will find it to understand．

Being tall gives Yao Ming a(n) _______ over other basketball players. 

In fact, _______ one cause that leads to the problem.