List of top English Questions on Active and Passive Voice

Out of the four alternatives suggested, select the one which best expresses the following in Passive Voice: They are teasing you.

Select the appropriate option to convert the following into active voice.
"Why was such a letter written by your brother?" 

Mark the correct Active Voice of the following:
"The wall is being built by the mason."

Choose the option which best expresses the same sentence in Passive Voice.
Somebody cleans the room every day.