Do you _________ or serve in an organization or are you a member of some group?

(2013·宝鸡二检)In my brother's absence, I would like to thank all concerned on his ________.

The new invention made last month would have a variety of _______ in industry.

______children whose parents had died in Wenchuan earthquake _____sent to live with families in other cities.

---What does Old Walter usually do in his retirement?---- These days he is ______ memories of village life for his new book.