Sure! Here are suitable words or phrases to fill in the blanks:

1. Families in our neighbourhood **collect** rubbish and clean up the streets together once a week.
2. Trang and I **exchanged** paper for the Paper-Plant-Exchange last week.
3. I can **gain** some career and personal benefits from doing volunteer work such as increasing social skills, improving self-esteem, and job opportunities.
4. They **donated** a lot of clothes, books, and rice to poor children in Ha Giang province recently.
5. I want to spend this summer holiday teaching and **helping** homeless children.
6. The Help Lonely People project in 2016 **enabled** me to help 200 people.
7. My parents always **encourage** me to participate in volunteer campaigns to help needy people.
8. Our school **recruited** 20 volunteers to join the Postcard-to-Help project last year.
9. We will **reuse** some used paper and cartons for new notebooks.
10. When I grow up, I will **work in** a nursing home to help old people.