Free Rice
If you are currently bored and want to help feed people, then try this: http://www.freerice.com
In this site, you are to click on synonyms of a given word. Every correct answer you make is equal to a donation of 20 grains of rice. For example, if you have 5 correct answer, then you have donated a total of 100 rice grains!
There's also a "Vocab level" so you would know your current level and a "Your Best Level" so you would know the best level you have.
So come and help. You'll learn at the same time.