11. Last summer, we provided evening classes_______ twenty homeless children.
A. for B. on C. about D. to
12. Nearly every American has done volunteer work_______ his or her life.
A. up B. at C. in D. on
13. People who live_______ street are called street people.
A. under B. in C. at D. on
14. What do you know _______community service?
A. to B. about C. on D. from
15. We often visit and help old people in Sunflower nursing home_______ weekends
A. from B. on C. at D. in
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