One of the hardest standards to teach and develop in first grade students, in my opinion, is vocabulary acquisition and use. Students by the time they leave first grade are supposed to be able to use words and phrases acquired through conversations, reading and being read to, and responding to texts, including using frequently occurring conjunctions to signal simple relationships (e.g. because). I have found this advanced skill is worth practicing each week for those students in my classroom that have mastered the basic first grade spelling words.
In place of the weekly spelling tests I have prepared vocabulary acquisition and use pages for those more advanced students. On each of these pages the students will take the three words or phrases listed on the practice page and use them to write a complete paragraph. They begin to understand more fully what the vocabulary means while assessing their own work by using the rubric that I copy on the back of each page. The words that I have chosen for each page correlate with the building background/vocabulary words used in the Journeys Reading Series. They can of course be used separate from the series, however if you use the series I thought this would be beneficial for it to be something you have specifically talked about in class. I hope these work at differentiated activities for those students in your classroom that need additional practice with this skill.