Turn these sentences into the passive:

1-  We speak only English in class.

      Only English in class.

2- They are watering the garden.

     The garden .

3- Someone stole my car this morning.

    My car this morning.

4- Christopher Columbus discovered America.

     America by Christopher Columbus.

5- They were serving lunch when we arrived.

     Lunch  when we arrived.

6- You should respect your parents.

     Your parents.

7- We will build a new bridge.

     A new bridge.

8- They have painted their house blue.

     Their house  blue.

9- Marconi invented the radio.

     The radio by Marconi.

10- We will have finished this work by next week.

       This work by next week.