This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to make a glue gun
Cut apart a soda can to get a flat sheet.
Use a craft blade to slice the top and bottom off of a soda can. Use a pair of scissors to cut the tube open to form a flat sheet.

Choose from:
[1]. Make sure that the soda can is clean. You can clean the metal before or after you cut it.
[2]. The flat sheet will help to dry the bottles. Mix together isopropyl alcohol and liquid soap.
[3]. If you prefer, you can decorate the soda can as you create it. Poke a hole at the top of the soda can.
[4]. Place a pencil mark on the sheet of paper that will become your base. Line up one end of the blank side of your paper with the pointed edge and stuff it with tiny pieces of tube that poke out the other side.
The answer is:
[1].