Answer:
Revised (active voice): Superintendent assumed that the trip had been postponed until the next Thursday.
Revised (active voice): By the 15th of every month, the completed form should be submitted to Tim Hagen.
Revised (active voice): The fluid should be allowed to dry for eight to ten seconds after being applied sparingly.
Revised (active voice): Researches defined the metropolitan area as the countries related by communiting patterns.
One thing my professor suggested was to make a draft of your thesis (you can always edit it later) and start on the body paragraphs. Do the conclusion and intro paragraphs afterward.
A simple sentence is not mistaken
For the clincher, i would put your opinion on whether or not you agree video games are positive, and then give a statement as to why you think that.