根据句意和汉语注释，在答卷标有题号的横线上，写出单词的正确形式。
(1)He seldom (回复) to the e-mails his friends send him.
(2)Our English teacher has offered us some useful (建议). I think they will help us a lot in our English study.
(3)I came here (专门) to invite you to my party.
(4)Listening to music can make you forget your (悲伤).
