Grammar?? it's my favorite subject of English.
You probably had Patrick Duffley as a grammar teacher in your first year in the BEALS. What I would suggest you is to use the same kind of model. Instead of having students fill in the blanks, have them complete the context so it makes sense with the given grammatical form. Also, grammar should never take more than 1/4 of your curriculum. In my second practicum, my associated teacher told me that the best formula to teach grammar is to teach a grammatical feature for 15 to 20 minutes MAXIMUM! then, you move on to something else in which the said grammatical form in highly present, you have the student do an activity on the thing, but not on grammar.... after, when you correct and put together the answers of the activity, you raise their attention to the grammatical feature and capitalize on the usage and also how it corresponds to what you said at the beginning of the class. The following class, you recap in 5 minutes and you use the restof you 10 to 15 minutes to move on to something harder that can be built on what you learnt the previous class. Repeat rinse and voilà! :P I hope it has helped you.