"______ voice" is most-preferred in writing.

Active

Passive

Both are equally preferred.

2.

It is preferable to use "_____ voice" when emphasizing the receiver of the action, when you don't know the performer of the action, and/or in scientific or technical writing.

active

passive

3.

"The test was failed by most students in class." This is an example of what type of "voice"?

active voice

passive voice