To avoid the look of missing data in a report, use the hide duplicates property on field

The correct answer for the blanks is : Primary key field
The primary key field is a place to record data that is unique to each record in the database or file. When you perform your hide duplicate command on primary key field, it will prevent any records from having the same value

Usually this mountain-building process produces majestic peaks and steep slopes. you should look for these along the other features.