单选题 Complete the sentences below.
Choose NO MORE THAN ONE WORD from the passage for each answer.
Write your answers in boxes on your answer sheet.

填空题 In order to have a complete understanding of how people's minds work, Martin Seligman suggested that research should examine our most positive ______ as closely as it does our psychological problems.

填空题 Soon after arriving at a ______ in their lives, people become accustomed to what they have achieved and have a sense that they are lacking something.

填空题 People who are ______ by nature are more likely to succeed if they make thorough preparation for a presentation.