Didn't have science lessons yesterday and today

Didn't have science lessons yesterday and today

Yesterday, while Ms Tan was teaching Digestion, some of my classmates kept making noise, and that pissed Ms Tan off. She said that since we were enjoying ourselves and making so much noise, we could continue doing it. She gave us some notes and asked us to read it on our own, without even explaining anything!

So, she sat down at the teacher's table and marked worksheets.
I didn't really know what was happening, so i assumed that she wanted us to read the notes on Digestion. For the next 30 mins, we just sat there quietly. And when the bell rang, Ms Tan just stood up with her things, and walked out.

Today, when she came in, her face was so sulky. She didn't even say a word to us. She wrote on the whiteboard some assignments for us to complete, then told us, "Its so amazing how some students can have 2 chairs, while the teacher doesn't have a chair. I'm going down to the staff room to sit down." She took her things and left.

I was shocked. She didn't even teach anything, and asked us to do the workbook! Although the information coud be found in the textbook, but she should at least teach us something right? How can she just walk out like that?

So, the class was left to do the science theory workbook for the next 2 periods.

I guess Ms Tan was really upset with us. 3 periods of science just wasted like that, when it could have been very informative. T.T