Write two advice using should, shouldn’t or ought to when someone is not feeling well. As you can see in the following example. Hi friend, I think you should go to the doctor to get a checkup

The bell is just a signal that the set time of the end of class is passing. the teacher lets you know when it's okay to leave.

In mla style, the works cited page provides information about all the sources cited within the paper or document written. it is often place at the end of the work and it generally   contains the complete name of the author, name of the book/article, etc, place and date.