根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

In an online class, developing healthypatterns of communication with professors is very important. 36 While I have only listed twoof each, these are obviously many other situations that can arise. Studentsshould be able to extend the logic（逻辑）of each to their particular circumstance.

Do's

• 37 Questions about subjectcontent are generally welcomed. Before asking questions about the coursedesign, read the syllabus（教学大纲）and learning management system information to be sure the answerisn't hiding in plain sight.

• Participate in discussion forums（论坛）, blogs and other open-endedforums for dialogue. 38 Be sure to stay on topic and not offerirrelevant information. Make a point, and make it safe for others to do thesame.

Don'ts

• Don't share personal information orstories. Professors are not trained nurses, financial aid experts or your bestfriends. If you are in need of a deadline extension, simply explain the situationto the professor. 39

• Don't openly express annoyance at aprofessor or class. 40 Whena student attacks a professor on the social media, the language used actuallysays more about the student. If there is truly a concern about a professor'sprofessionalism or ability, be sure to use online course evaluations to calmlyoffer your comments.