Each month (or quarter), have your middle school students research and write about a current Science event. You can either do this in-class or make it an at-home assignment. Easy, quick grade for Science no matter what unit you are covering. Detailed instructions to the student on what is expected and an easy rubric for the teacher to follow with clear grading instructions.
I've had students come back to me in high school and say that it helped them organize their thoughts and do much harder research projects in high school.