A good quiz !

Here is a nice web site that helps you with your vocabulary.

http://www.freerice.com/

It does more than that, when you play it you donate a few grains of rice to the hungry people around the world.
Another site where you can make free donations is http://www.thehungersite.com
If you need a clue you can always try http://www.onelook.com/ this is an online dictionary. Here is a thesaurus http://thesaurus.reference.com/ it will help you find similar words eg expensive and costly.