Connectors to express purpose

In order to, to, so as to
http://www.myenglishpages.com/site_php_files/grammar-exercise-purpose.php

in order to, to, so that
http://www.englishexercises.org/makeagame/viewgame.asp?id=6268

for, to
http://www.perfect-english-grammar.com/purpose-exercise.html