Questions 16-20 are based on the following.

How to Use a Glue Gun

The word 'Glue Gun' may sounds dangerous to us, but it is not an actual gun to shoot a bullet. Instead, it can help us in making handicrafts. In the process, the heat from the gun will melt the glue stick and turn it into liquid form that we can use to stick anything including the parts of our handicraft. Follow these steps if you want to use the Glue Gun.

1. Check the glue gun and clean out any old glue clogging the nozzle.
2. Put the glue stick into the gun nozzle.
3. Insert the plug into the electricity socket.
4. Prepare a sheet of paper and put the glue gun on it.
5. Wait until the gun gets warmer.
6. Squeeze the trigger gently to check if the glue stick has changed into liquid form.
7. Finally, you can apply it on any surface that you want to stick by using this glue gun.

(Source: http://www.bigbanktheories.com/5)

Where do we insert the glue stick?