Answers: Active voice, passive voice

Active voice (you must say who did it!) Passive voice Do they mean the same?
I have completed the first two for you. The first two have been completed for you. Yes
What shall we do? What is to be done? Yes, probably.
We / They obtained insufficient data in the experiment. Insufficient data was obtained in the experiment. Yes
The postman opened the door. The door was opened by the postman. Yes
Shakespeare wrote Romeo & Juliet. Romeo & Juliet was written by Shakespeare. Yes
We will prosecute shoplifters. Shoplifters will be prosecuted. Yes.
The police arrested the criminal near the Post Office. The criminal was arrested near the Post Office. Yes
We can't use all verbs in the passive. Not all verbs can be used in the passive. Yes