  unskilled labor to assist with hauling of materials, placing of catalyst elements, and clean up.
Hauling materials, placing elements, and clean up is unskilled labor.
Cleaning up and hauling materials is highly skilled labor.
Oh my, what did he do?
The same thing will definitely not happen when I sell the Honda.
People look at lighted buildings.
A dog sleeping indoors
Two men spin so fast they take flight.
A basketball player holds the ball.