Jawaban:

1. fire destroyed some houses last night

- some houses were destroyed by fire last night.

2.did the audience enjoy the concert yesterdey

- were the concert enjoyed by tge audience yesterday?

3.my brother has washed our both motorcycles for an hour

- our both motorcycles has been washed by my brother for an hour.

4.will jhon return the money next week

- will the money be returned by jhon next week?

5.we always manage the time carefully

- the time is always managed by us carefully.

6.my mother is making some cakes at the moment

- some cakes are being made by my mother at the moment.

7.does he watch an english program on televesion every night

- is an english program on television watched by him every night?

8.has anybody taught you how to behave

- has you been taught by anybody how to behave?

9.now, a shopkeeper is still wrapping up your new books in newspaper

- now, your new books is still being wrapped by a shopkeeper in newspaper.

10.they will organize a new group next week

- a new group will be organized by them next week.