Fill in the blankets with the words underlined in their correct forms to complete the following paragraphs. strut ; reveal ; leading light ; shortage ; dread extrovert ; introvert ; unnoticed ; personality ; cooperative A recent psychological research (1)_______ the most common signs of introversion. Some of these (2)______ traits are unexpected. For example, did you know that (3)_____ don't consider their casual acquaintances (泛泛之交) to be friends? Also, they take a long time to process and sort out information, and they even (4)_____ returning phone calls. Suffering from a (5)_____ of confidence, they would rather be alone with their every movement going (6)_____. In contrast, (7)______ don't spend as much time contemplating their personalities. Why? Because they're too busy partying and interacting with other people and (8)______ around the office. (9)_____ and helpful, they are more likely to be the (10)_____ in a group or organization.