题目

We were finishing the first lesson, just Lori and me. We had spent the _______ taking baby steps. She had led me down the shallow wheelchair-access slope into the pool, _______me to take a step deeper, and then another.I had been afraid of water my whole life. At age forty-four, I had no _______ of ever enjoying any body of water. Even walking around the edge of a pool was unsettling. I _______my fear in order to save face, and few people _______ I feared water.When the water reached my chest, Lori could tell I had reached my limit. I had _______my first ever swimming lesson. I breathed a sigh已知椭圆Σ的两个焦点分别是F1（-2，0）、F2（2，0），并且经过点P（52，-32）．（1）求椭圆Σ的标准方程；（2）求∠F1PF2的平分线所在直线的方程．