Here are two context clues worksheets on the noun congress if you can use them. Incidentally, these present an opportunity to help students further differentiate between proper and common nouns–congress is used both ways in these documents. A simple question like “Why is this noun capitalized in some sentences and not in others?” would push the conversation in the direction you need it to go to develop understanding of this area of usage.
If you find typos in this document, I would appreciate a notification. And, as always, if you find this material useful in your practice, I would be grateful to hear what you think of it. I seek your peer review.
