In this task the focus is on physical knowledge about the world. Given the provided goal task in the input, describe a process that would lead to the asked outcome. This process often involves physical motions with objects, such as moving them, arranging them in a certain way, mixing them, shaking them, etc. 

To remove the protective cover from a wire, you can
Use a wire stripper

To clean used upholstery leather.
Apply leather shampoo.

Once you have filled a sinkhole with concrete and sand what additional steps can you take to stabilize it?

Fill whatever depth remains to the sinkhole with topsoil. Finishing the hole with topsoil will allow plants to grow on top of the former sinkhole and stabilize the soil and sand.