1 . You should a_________ to your father. After all it was your fault. (道歉) (根据中英文提示拼写单词)

2 . I am writing to_____________ to you for not being able to make it to the bookstore with you yesterday.（道歉）（根据汉语提示单词拼写）

3 . You should ________ (apology) for not being able to join them for dinner. （所给词的适当形式填空）