I use these quizzes in my Spanish II classes to assess students on the use of por and para. In these quizzes students must complete each sentence with the either por or para and then say why they used that prepositions.
There are two quizzes in the file. I used the second one as a retake for students who did poorly on the first one. You could also use it as an alternate if you have more than one section of the same class.
Click here to see my reference sheets and practice activities for POR and PARA.