Lesson 14, Exercise 10 - Bill Part 2

Watch the video. Answer the question.
 
source-of-river.jpg
Vocabulary:
They're awful. They're the source of the entire world's problems.
Source (adjective): origin, root, beginning.

For example, mountains and springs are the source (origin) of rivers.




If you need a translation to your own language, use the Google Translate button at the top-right of the screen.