Active and Passive Voice

Which sentence is written in active voice?

Whom or what is doing the action? Type in the correct noun. If you are unable to determine who or what is the performer (agent) of the action, type “unknown.” The exam was failed by over one-third of the students.

Whom or what is doing the action? Type in the correct noun. If you are unable to determine who or what is the performer (agent) of the action, type “unknown.” Joy enjoys spending time with Mark.

Whom or what is doing the action? Type in the correct noun. If you are unable to determine who or what is the performer (agent) of the action, type “unknown.” Experiments were conducted in order to test the hypothesis.

Which sentence is written in active voice?

A motorcycle is ridden by Peggy, a proper and well-respected librarian.

Which sentence is written in active voice?