Here are the completed sentences with the correct forms of the words in brackets:

14. We **visited** Nha Trang. We **were** there in 2013. (be/visit)
15. If you are **interested** in this volunteer project, contact us for more information.
16. Donating food and other essential items is practical and **helps** the local people.
17. Members of our volunteer clubs are **excited** about raising money for charity.
18. You made so **many** mistakes. Please check the detailed record of all the donated things.
19. Volunteering can be **tiring** sometimes, but it can help us find a purpose in life.
20. Homeless children are **helped** victims. We need to protect them.
21. We are looking for volunteers for an **interesting** project in our local area.
22. If you want to volunteer, there are **endless** opportunities for getting involved.