Here are the completed sentences using the words from the box:

1. It is the first time I have done the **volunteer** work.
2. We have **gone** to this village to do volunteer work several times.
3. On the way home I **helped** an old lady go across the road.
4. We provided foods for the **patients** in the hospital last week.
5. Up to now, my class has collected hundreds of old books and clothes for the poor children in **homeless** areas.
6. My friend opened the evening **classes** for the poor children.
7. Youth volunteers regularly **clean** the streets and plant more trees.
8. I **donated** blood for the first time almost a year ago.
9. The storm was terrible. Many homes were destroyed and many people became **mountainous**.
10. It’s good to donate blood because you can **save** people's lives.

(Note: There may be a mistake in sentence 9, as "mountainous" doesn't fit. The context suggests it should refer to a state like "homeless" or "displaced.")