A. Because many people aren't sociable.
B. Because most people are shy by nature.
C. Because nobody will laugh at shy people.
D. Because shyness is difficult to overcome.
A. By prediction.
B. By recording.
C. By observation.
D. By examination.
A. To observe people's attitude towards strangers.
B. To see how people get along with their friends.
C. To test people's behavior in social life.
D. To find out how shy people are.