The kilogram is the only pure SI unit for mass. The derived unit, the gram, would be more appropriate for a spool of thread though.
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The mass of a spool of thread would best be measured in grams (g) or kilograms (kg) in the International System of Units (SI).
The best unit of measure to measure five books would be "books" itself. Books are typically counted individually rather than measured in terms of length, weight, or volume.
The best unit to measure the distance from Fairbanks to Anchorage would be miles or kilometers. These units are commonly used to measure long distances between cities and are widely understood.
Millimeters.
pounds
The best unit of measure to measure a bookshelf would be inches or centimeters, depending on the standard unit of measurement you prefer. These units provide a precise representation of the bookshelf's dimensions.