Use this video to quickly review the letter combinations and sounds with your class. Repeated exposure to keywords and reviewing phonograms will help your struggling readers, and the activity it so quick and animated that your non-struggling readers won't mind participating, too!
You can have the students call out one at a time, in small groups (ie, Table 1, all the girls, etc) or as a whole class. The video is 4 minutes long--because the animations are "chunked" in to sections, it would be easy to do only parts of the video at a time.
4 minute video (Can be watched in smaller chunks)