1. Appropriate eye contact is very important when you talk to another person. When a person does not make any eye contact during a conversation, people may think that the person is not being honest.
2. A firm handshake is also important. Many people think that a firm handshake shows that a person is confident and open.
3. Everyone is regarded as equal, so people generally talk more casually, even to the supervisor. Of course, it is also not appropriate to be too informal with classmates and supervisors in the school.
4. When you do not understand something, always ask. People will not think less of you if you do this. In fact, they will appreciate that you are interested in understanding correctly. (Cited from “In the Workplace: An Intermediate Integrated Skills Textbook” )