To accurately complete the statements with the correct symbols for segments AM, BM, AB, and CD, it's necessary to have an understanding of the relationships between the segments based on their lengths or positions, which would typically be indicated in a diagram.
Since I can't see the diagram you are referring to, please provide information or the relationships you would like to know about these segments. For example, if M is a midpoint of AB, then you could state that AM = BM, and if we know the lengths or relationships of any of the segments, we can use the appropriate symbols (like =, <, >) accordingly.