Firstly, A. one of the assignments was to post the words you have written in your notebook until now on this site.
(Last week's homework).
Then, B.  I requested that you post the list of words you made today at the end of the list A.
(List of words from today's class. Please make sure to separate list A and list B so that the reader can
differentiate the two lists.)

Okay, I hope this is clarified.

Now Secondly, the correction of your sentence.
Your sentence : Some concept occur to mind while on bus. If I ride on bus, then I sit on the seat. What can I do  in the bus?
There are many people around me. So I have to becareful of them. Some of them will probably sleepy and tired. So I just close my eyes quietly. Then some concepts suddenly occur out.
Correction : Some concepts occur to mind while I am on the bus. When I am on the bus I am sitting on the seat. What can
I do on the bus? There are many people around me and I have to be careful of them. Some of them will probably be sleepy and tired. So I just close my eyes quietly. Then some concepts suddenly occur to my mind.

Good effort!

Thirdly,
I have two questions.
1. Why do you think you have to be careful of the people around you?
2. What are some concepts which occured to you? If possible, please explain in detail.