Fixing Run-On Sentences

How do you fix a sentence that is a run-on sentence? Read the directions and examples completely and carefully before starting.Make sure you add the comma beforethe conjunction. The girls play football, and the boys play soccer. The students did their homework, so they could have some time to play after school. I thought I saw a rat, but it was a hamster. Sarah bought a new computer, but she never uses it. My parents surprised us, and they told us we were going to Tennessee. We are going to buy a new house, or we are going to fix this house. My brothers are busy cleaning the kitchen, but I will have to clean all of the other rooms. The bell rang, and the class started right away. We waited at the door, but no one ever answered.