Kvetch most nearly means:

Scientists believe that a black hole is created when a supernova from a large star collapses on itself. This collapse causes a gravitational field that grows more and more intense until nothing can escape from its pull, not even light. It's thought that the universe may end as a black hole.
According to this passage:

Determine which of the choices best solves the problem shown in the first picture and then mark the corresponding choice on your answer sheet. The problem is presented in the first drawing and the remaining four drawings are possible solutions.

Uncontrolled, rapid drying of wood (for instance, lumber) causes

A wall is 7 feet 8 inches in height; four vertical pieces of wallpaper are needed tC. ver the wall. Assuming there is no waste, what is the minimum length that a roll of wallpaper must be tC. ver the wall?