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。
He seldom __________ (回复) to the e-mails his friends send him.
Our English teacher has offered us some useful __________ (建议). I think they will help us a lot in our English study.
I came here __________ (专门) to invite you to my party.
Listening to music can make you forget your __________ (悲伤).