The first officials of sporting events were __________.

The mental operation of ___________ governs what we do, how we do it, and how quickly we do it.

The pattern of yellow lines on the roadway determines whether __________ is permitted.

Today, fringe benefits account for approximately ______ percent of total payroll costs.

Try not to park next to ____________ or vehicles that are too close to the white space markings.

_______ was the first person to propose the idea of moving continents as a scientific hypothesis.

Until the early _______ there were only negligible amounts of free oxygen in the atmosphere.

The energy that warms earth's surface comes primarily in the form of __________.

The ______ of a seismograph moves

Oxfam america, doctors without borders, and the red cross are examples of __________.

Impacts of global warming include all of the following except ________.