Fill in all the gaps, then press "Check" to check your answers.
Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
(Source: “Microsoft promises to grow 30 % greener by 2012” Retrieved from
http://www.maximumpc.com/article/news/microsoft_promises_go_30_greener_2012 on August 12, 2010)