Only one. Just as long as you hand him the damn lightbulb.
Two. One to do it, the other to give him his ribbon.
Change Whatever do you mean, *change*
5,6,7,8.
None. Social scientists do not change light bulbs they search for the root cause as to why the last one went out.
Because then it would be a foot
Write "Please turn over" on both sides of a page and hand it to her.