一、根据句意及中文提示写出所缺单词的完全形式
1. This program is meant to help those who are _________ (上瘾) to smoking.
2. All the books in our library are c___________ （分类）by subject.
3. I don’t understand that you did your best to help him but he didn’t even b__________（花费时间、精力做某事）to say a word of appreciation.
