Final answer:
If a donor lacks a middle name, you should leave the middle name field blank or use placeholders like 'N/A' or '-', adhering to the specific form or organization's guidelines.
Step-by-step explanation:
When completing forms that ask for a middle name and the donor does not have one, it is appropriate to either leave the middle name field blank or enter an indicator such as "N/A" (not applicable), "None," or a dash (-). This varies depending on the specific requirements of the form or the organization's guidelines. It is important to follow the instructions provided with the form. If the instructions are not clear, you should contact the organization directly for clarification to ensure that your entry is processed correctly.