a. Complete test – http://www.businesswriting.com/tests/activepassive.htm
b. After completing the test on changing to active writing, I have a new found respect for those learning English. I manage to get most of them correct, and was able to work out where I went wrong when presented with the answer. However I feel there is so many ways to write with the same meaning, depending on whether you are narrative in tone, or if you are writing for the news.