解析：
offer v. 提供，试图
He didn't offer any explanation for his behavior. 他没有对自己的行为作出任何解释。
offer one's service 主动帮忙
解析：
remember v. 记得，记住
I don't remember my first day at school. 我忘了第一天上学的情景。
remember oneself 反省
remember to do 记得去做某事
remember doing 记着已经做过的事
,
