One of the best ways to improve fluency in students is to have them become better at phrasing. Fry Instant Phrases do just that. This handy set of cards includes six sets of 100 phrases for a total of 600 phrases. They are perfect to work with students in small groups or to put them in a center for students to practice together.
If you want to keep track of which phrases your students are fluent with, you may want to use my Fry Instant Phrases Assessments available at my TPT store.