期中完型(完形填空)

On Thursday afternoon Mrs Clarke locked the door and went to the women's club as usual, It was a pleasant way of passing time for an old woman who lived alone.When she came home she sensed something ①unusual. Had someone got in? The back door and the windows were all locked and there was no sign of forced entry(进人).Had anything been taken? She went from room to room, checking, and found her camera and spare watch missing.The following Thursday she went out at her usual time, but didn't go to the club. Instead, she took a short walk in a park nearby and came home, letting herself in through the back door. She settled down to wait and see what would happen.
It was 4 o'clock when the front doorbell rang. Mrs Clarke was making tea at the time. The bell rang again, and ②the next moment she heard her letter -box being pushed open. picking up the kettle(壶)of boiling water, she moved quietly towards the door. ③A piece of wire appeared through the letter-box, and then a hand. The wire turned and caught around the knot（圆形旋钮）on the door-lock Mrs Clarke raised the kettle and poured the water over the hand. A sharp cry was heard outside as the wire fell to the floor and the hand was pulled back, which was followed by the sound of running feet.
It wasn't long before the police caught the thief. And Mrs Clarke was greatly admired at the club for her successful self-protection.[ ①处为什么不能用bad，联系下文可以解释为“有种不祥的预感” ②处为什么不能用for a while，哪里突出时间长短了 ③处能翻译一下吗，没太看懂过程

解题思路： 如下
解题过程：

①处用unusual比较恰当。意思是"老妇人到家后觉得屋里情况异常".
②处表示时间的顺序，the next moment是"紧接着"的意思,表示第二个动作继第一个动作后发生.而for a while的意思是“一会儿”，表示动作持续的时间。
③处的译文：一根铁丝通过信箱伸了进来,然后便是一只手。铁丝弯曲缠绕着门锁上的圆形旋钮。 Clarke 夫人拿起装有开水的壶去烫这个贼的手。只听见尖叫一声,铁丝落地,手伸回,接着便是逃跑的脚步声。
最终答案：略