Amy and Tom are going to have a busy day next Sunday. In the morning, Tom is going to visit his aunt and Amy is going to buy a cat in the pet shop. Tom is going to have lunch with his aunt. After lunch, Amy is going to borrow some magazines and story books in the library. Tom is going to buy a dictionary and a new CD in the bookstore. Finally, Amy and Tom are going to buy some apples and go home by subway together.

袁明从小就乐于助人。上中学后，他竞选上了班长。他充分利用自己的感召力，调动同学的积极性，该班一举夺得了“优秀班级”的称号。他的表现让我们懂得（   ）
①在班级中要充分发挥自己的特点和优点                                                                        ②只有都去竞选班长，才能为班级出力
③在班级中我们要善于开发自己的潜能，在班级特定的位置上贡献自己的力量        ④在班级中我们个人能力的充分发挥有利于整个班级的发展