-- Is air the lightest thing in the world?-- Not . Scientists from Zhejiang University have just developed the world’s lightest material.
They had a wonderful time. They ate and ate until no food on the table.
---Is the Great Wall a wonderful place? ---Yes, tourists come here for a visit every year.
Not only , but I learned some knowledge.
---Where would you like to go? ---I’d like to go .
Can you me information about the student exchange program?