A.They don't want to be considered impolite.
B.They try to show their rich knowledge.
C.They are afraid of being left behind.
D.They want to become more outgoing than before.
A.Speaking loudly.
B.Making clear their points.
C.Laughing a lot to ease others' discomfort.
D.Showing warming and friendly feelings.
A.A big and warm hug.
B.A good wish for others.
C.A special and meaningful gift.
D.A smile and a sincere handshake.