Roberta appeared on the stage. She took a______ breath and began to speak. Now she was Portia, a strong-willed character in Shakespeare’s The Merchant of Venlce. The theater was filled with people. She was speaking with a ______ she had never before experienced, the words flowing（流动）smoothly from her.In fact, Roberta had never acted in her life before the audition（选拔试演）. She ______ being in front of other people. She was very shy at school. She had never thought she was good enough at anything to ______ much attention. She stayed mostly to herself, making few friends. She