answer:You must set the groundrules for discussions immediately. You must explain that each student needs to listen to others answers and show respect at all times. If it starts to get heated, end the conversation. You can have them raise there hands and not speak until they are called on – until they learn to converse with civility. As for the elder student, you must take her aside and advise her that her going off topic and speaking out of turn is disruptive, and even enlist her help in making the class go smoothly. Be strong, and advise them all when they are going off track, you will end their time speaking. It’s your job. The rest of the class will appreciate it.