Answer:
The student read a new book.
Many students protested the new uniform requirement.
The peacemakers signed a new agreement.
These sentences are written in an active voice because the subjects do the action.
(e.g the student does the action of opening a book, the peacemakers did the action of signing an agreement).
In the sentences written in a passive voice, the subject doesn't do the action, but the action is reflected on it(e.g. The books are not doing the action of opening, but they're being opened by the students, the papers did not sign theirselves, but they were signed by 20 representatives)
