This website is free and gives you all the vocabulary workshop answers for all of the levels. If an answer is wrong email me at firstname.lastname@example.org. Sorry about the inconvenience, they took the answers down.
Get our android app here: http://www.appsgeyser.com/171975 its free and will allow access to the site from your mobile android phone.
Make sure under settings the unknown sources box is checked to allow it to download.