根据句意和汉语提示写出单词,完成句子.
His uncle is going to (参加)a business meeting in Beijing next week.
Helen enjoys (listen) to soft music when she is tired.
We should speak to the old people (polite).
They came up a good idea to keep their classroom clean and tidy.
Changbai Mountain in Jilin Province is a good place to fun.
If you borrow books from the library,give back on time.