11. We_________old clothes and books to poor children.

A. interacted B. donated C. balanced D. applied

12. Their contributions were_________to the homeless people.

A. meaningless B. serious C. meaningful D. invalid

13. He feels_________about teaching English to children in remote areas.

A. excited B. hopeless C. helpful D. interested

14. Protecting the environment is one of the issues that every country is deeply_________about.

A. interested B. determined C. dedicated D. concerned

15. Volunteering helps us_________with new cultures, speak new languages and meet new friends.

A. connect B. interact C. combine D. apply

16. Our first_________is to improve the life quality for mountainous people.

A. priority B. facility C. post D. opportunity

17. It will be_________for us to do something good for our society.

A. narrow-minded B. handicapped C. helpful D. public

18. The campaign is designed to increase_________awareness of the issues related to the environment.

A. remote B. public C. meaningless D. creative

19. Your music is very ____. Can't you just stop it?

A. annoying B. interesting C. annoyed D. bored 

20. If you can do something to help others, you will find your life ____.

A. meaningful B. meaningless C. helpless D. interested