I (wathed / was watching) TV last night when I (heard / was hearing) a strange noise outside my window. I was frightened, but I decided to…

I (wathed / was watching) TV last night when I (heard / was hearing) a strange noise outside my window. I was frightened, but I decided to investigate.As I (walked / was walking) towards the window, the curtain (started / was starting) to movie. Then I (realized / was realizing) that the noise was my cat trying to climb in through the window.