Transform the following sentences into Passive.
1.People learn foreign languages.
2.They are airing the classroom.
3.He has bought a car.
4.Somebody cleans the room every day.
5.She has lost the keys.
6.They were looking for the key everywhere.
7.They will change the date of the meeting.
8.Nobody asked me to come back.
9.When I came in they had already examined my friend.
