Another science website found by my wife: KS3 Science.
KS3 Science has educational activities for Biology, Chemistry and Physics for grades 7, 8, and 9.
The resources are sorted by grade and topic. They are mainly fill-in the blank with drop down multiple choice selections, but can be used for review, reinforcement of content. They can also be given as assignments for students to do on their own. The students can even check their answers and see how they did.
Definitely a site worth checking out if you teach science.