Write the next sentence in the following story.

How to install torch down roofing
Remove any old roofing, debris, or other objects from the surface that is to be roofed.
Removing old roofing is not always necessary; check with local building codes. Often, torch down roofing can be installed directly on top of old roofing.

Select from:
1). Remove any apparent cracks, cracks, or damages. These may indicate the building's foundation has fallen inward or been turned over from the wind, and repairs might be needed.
2). Secure metal flashing to the edges of the roof area. Apply primer to the metal flashing to allow the torch down roofing to adhere to it more easily.
3). These roofing sites typically are shaded by trees and other structures. Study the damage caused by the torch down roofing.
4). Inspect any existing roofing or debris and remove any bumps, slopes, or underlevels of the roofing. Visit a roofing school and have your students bring their own kits.. The answer should be
2).