问题详情：
1．Today I met the new manager and we agreed ________ basic policies.
2．Many retired people can still contribute ________ the society with their rich experience.
3．The organization has been ________ existence for 15 years so far.
4．You'll find the map ________ great help when traveling in this area.
5．Remember that using a helmet is the best protection ______ head injuries.
6．He was writing a letter to the expert ________ the request of his father.
7．What did he say in relation ________ what happened yesterday?
8．Apart ________ schoolwork, I spend my spare time in singing and fishing.
【回答】
7．to
知识点：完成句子
题型：书面表达
