give the appropriate preposition:
1.some poor children felt hopeless....english
2.i hope to do something good ....our community
3.doing volunteer work helps me to interact.....new cultures
4.he dedicated himself to fighting.....the rights of poor people and women
5.she worked as a volunteer.....a local zoo 3 years ago
6.last week i held a birthday party...children who are homeless
7.the government plans to set....a regional library system
8.i volunteered,,,,service in the Air Force
9.all the students like joinning.....the Green Saturday Movement
10.at the end of her life she suffered.....Alzheimer's disease
