Exercise 31. She should __________ (让位于) a younger, more decisive leader.2. It _________ (渐渐明白) me that something like honesty and loyalty to society was very important in our lives.3. She never _________ (未做；未履行）phone his mother on her birthday.4. He sat down and soon _____________ (专注于) the newspaper.5. He ______________ (意识到) his shortcomings after several failures.