EX 1:
1. Brian learned about history.
2. Debbie learned about the jungle.
EX 2:
1. True
( Tiêu đề: Volunteer Vactaions )
2. True
( Debbie: I spent three weeks in a Vietnamese national park )
3. False
( Debbie: My job was to count all the butterflies. )
4. False
( Brian: We visited the Mayan pyramids and other ruins. )
EX 3:
1. Because he wanted to study and learn more about the ancient Mayan civilization.
2. Because they can tell her about changes in the jungles.