This will probably help your friend: http://grammar.ccc.commnet.edu/grammar/quiz_list.htm

friend *

Hello Mojave :) Thank you very much for you answer. I'm actually trying to help a fried who wants to be an editor and so she basically needs to practice filling in gaps and to choose the correct parts of speech and so on. Thank you for your suggestion though, I appreciate your help :)

I think they used to call it the Journal, now it's Notebook.

You can just practice here at italki in the Journal section. Write a lot of test sentences with the different parts of speech and they will be corrected.