Chu family-late-night footsteps in the hallway-might be the

It was a cloudy night,no moon and stars can be found on the sky.Chu family was going to sleep because the time was late already.Suddenly,they heard footsteps sound in the hallway.They thought that might be the neighbours,so they ignored it.Lao and Zheng are collage students whose stay next to Chu family.At the same night,they found something was trying to get in the window.Also,they ignored it because they thought that might be the wind.At the same time,Xiao Ning who stays next to them found some garbage in front of her house.She thought that might be the wild cats whose did this.