Decide if the sentence is active (A) or passive (P) voice.

Source: dreamstime.com
1. _____ Someone stole my pen.
2. _____ One must do one's duty.
3. _____ The fields are overgrown with grass.
4. _____ This bottle contains milk.
5. _____ The dinner should be cooked now.
6. _____ He is known to me.
What are the answers for points 5 and 6?