某校九年级社会思品兴趣小组常常围绕社会热点开展探究学习。现搜集到以下资料，请你认真阅读，一起探究并回答问题。
材料一：喜？忧？
材料二：对？错？
材料三：惊!喜!
Don't worry about him. He's old enough to __________ himself.
