Grade 7: Complete the sheet on thermometers: do NOT spend more than 20 minutes on it. If you have not completed it, then just get your parents to sign the sheet saying that you did spend time on it.
Grade 8: Watch this video as preparation for next lesson. There is no written task with this homework.
Grade 9: Complete the sheet from the lesson, and then this optional, possibly life saving extra: read this important information website about the dangers of lightning, and the next time a storm is brewing up, check this site