Double Check the Punctuation in This Sentence
I think that I already know the answer to this question but I can't remember for sure. So I just need to double-check to be certain that it is correct. "I was looking at the Weekly Assignment List and the Syllabus and noticed that Lessons 25-28 are on the Syllabus but not the Weekly Assignment List; therefore, are we supposed to still complete those Lessons and turn them into you." What I was wonder is if I definitely need to end this sentence with a period. Like I said I am pretty positive that the punctuation at the end is right, but if not and/or there is a better way to write this sentence please let me know. Thanks
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