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.
all except " is okay unless you are writing something that will be sold" and possibly "can lead to serious punsishment"
