Today something bad happened. I got scolded for something i did not do.It all started during Chinese period......

I entered 3F as per normal and it was in the usual state of tidiness.Even before i sat down,the teacher was already giving out the Xi2 Zi4 that we did previously.I did okay and got 73 plus a packet of sweet. When she finished handing out the papers,she immediately gave us back our chinese compo to complete by today. As i was a slow writer,i did not care about anything else and started on the work.
Not long after,Ms Cheong suddenly appeared out of nowhere and saw all the litter at the back of the classroom.As Cher Yong and i were the ones right at the back,she told Cher Yong to pick up the litter around him. When i turned around to face her,she also told me to pick up the litter around "MY" table. While i was picking up,she started scolding me,"If i catch you having any more litter under your desk,i will ask you to clean up the whole school for me!" I was like,what the.... I must complete this work before the end of the period and there you are scolding me for something that i did not do.If it were my place and i had the time, iwould definitely pick it up.But because of the lack of time i had to put my prioritys right,my homework comes first. All she did was just scold and not do anything else like help, unlike some of my other teachers who are not that proud and who stick their noses in the air.
Because of her,i did not manage to complete my composition and had to stay back after school to complete it,taking around an hour. Such a waste of my precious time when i could have gone home earlier to study my SS test tomorrow.If i fail this... She will be reprimanding everyone again when it was you-know-whos fault...Hmph!