Matilda wants to program the character to say "Hello!" from different areas of the screen when the space key is pressed. The code is not working properly. She should _. A set of code with the following code blocks in order. When space key pressed, go to random position, hide, say Hello.

add the "pen down" command
remove the "hide" command
change space key to down arrow
replace the "hide" command with the "show" command