A.Similar researches in other counies.
B.The impact of social networks.
C.The degree of modernization.
D.The qulily of people's friendships.
A.They have the same ancestor.
B.Van Truong is a fan of Van Gogh.
C.Van Truong used her notes to form a Van Gogh's painting
D.Van Truong hopes to be a painter as famous as Van Gogh