【1】考查情景交际用语。禁止：mustn't；在街上玩：play in the street。mustn't情态动词，后跟动词原形，“一定不要，千万不能”的意思。所以班会课上，老师说了禁止我们在街上玩。她可以这么说：You mustn't play in the street. 故答案为：You mustn't play in the street。

【2】考查情景交际用语。本题考查打电话的交际用语。句型：May I speak to sb.? 我可以和……说话吗？因此你打电话找李叔叔，你可以这样说：May I speak to uncle Li? 故答案为：May I speak to uncle Li?

【3】考查情景交际用语。你：you；应该：should；吃些感冒药：take some cold medicine。所以当你感冒了，妈妈跟你说你应该服用点感冒药，她这么说：You should take some cold medicine. 故答案为：You should take some cold medicine。

【4】考查情景交际用语。每天：every day；锻炼：exercise；有益健康：be good for health。本题用动名词exercising做主语，首字母要大写。因此妈妈说每天锻炼身体对健康有好处，可以这样表达：Exercising every day is good for health. 故答案为：Exercising every day is good for health。

【5】考查情景交际用语。对学生而言：for students；远离：stay away from；抽烟，喝酒：smoking and drinking；必需的：necessary。本题考查句型：It’s+形容词+for sb. to do sth. 对某人来说做某事怎么样？from是介词，后跟动名词。所以老师说对学生而言，远离抽烟，喝酒是必需的。要这样说：It’s necessary for students to stay away from smoking and drinking. 故答案为：It’s necessary for students to stay away from smoking and drinking。