Two squares of this dotted net for a standard die (opposite faces total 7) are blank. What is the total number of dots that belong on the two blank squares?

In the row 2, blank, 5, 3 the squares one apart are opposite: 2–5 totals 7, and the blank in the row is opposite 3, so it needs 4. The blank above the row and the 6 below it become the top and bottom, so that blank needs 1. Together $4+1=5$.