Answer:
Part 1
The main reason why attitudes are more often revealed in spoken rather than written language is that "We speak far more often than we write, is the main reason that attitude are more often revealed in spoken word than written language."
Part 2
The main reason self-confidence is important in human relations is because "self-confidence makes you appear important in the eyes of other people. "
Step-by-step explanation:
Part 1: People normally communicate their ideas through spoken language much more often than the written one, every day's interaction demands verbal communication, for different reasons including, time and practicality.
Part 2: Important, influential and powerful people tend to be self-confident, then as a society, we understand that the people who present those elements must be in a higher level of any kind.