阅读下面材料,在空白处填入适当的内容(1个单词)或括号内单词的正确形式。
Shyness is avoiding human contact, often because of a feeling of not being as good as others and fear of taking risks. Shyness is a force 11 prevents us from realizing our potential and 12 (enjoy) the company of other people. Shyness is often associated 13 low emotional control and high negative emotions.
On the basis of research that he 14 (do) for the past six years, Dr. Zimbardo estimates that about 40 percent of all Americans, around 84 million people, consider 15 (they) shy. They include not only ordinary people but also a number of 16 (celebrity) who define themselves as shy. Research shows that a quarter of the people who are shy as adults were not shy as children.
Shyness makes it difficult 17 (meet) new people and make friends. It prevents 18 individual from expressing opinions and values. With authorities such as a boss or a teacher, the shy are less 19 (like) to stand up for their rights or express reasonable criticism. They’re more willing to obey and unwilling to be 20 (cooperate).