Answer:
(1) playing
(2) but
(3) because
(4) staying / sitting
(5) games
Step-by-step explanation:
(1) We need a verb here. What can teenagers do to video games? They can play them.
(2) The sentence shows a shift between games being fun to players needing to be careful. A transitional word like but fits perfectly here.
(3) We have a claim, followed by reasoning. The transition word because is best here.
(4) Honestly any verb would work here, staying or sitting is best in my opinion.
(5) This is a no brainer. The topic of the paragraph is video games.
Hope this helps!