Jawaban:

1) Many people are said to be homeless after floods.

2) The new law is known to be favored by the Prime minister.

3) The government is expected to lose the election.

4) It is thought that the prisoner escaped by the wall climbing. (no passive form available)

5) It is believed that the kitchen window was used by the thieves to get in.

6) Arthur is said to be very rich.

7) He is said to have 22 children.

8) The service is included in the bill.

9) This road is not used very often (by people).

10) All flights were cancelled because of the fog.

11) I was accused of stealing the money by somebody.

12) A new ring-road round the city is being built by them.

13) Our conversation was being recorded by someone, and I didn't realize it.

14) The date of the meeting has been changed.

15) Brian told me that he had been attacked and robbed in the street by somebody.

16) Complaints should be sent to the head office by people.

17) Your car might have been stolen if the key had been left in it by you.

18) The fire could have been caused by an electrical fault.

19) Next year's congress is going to be held in San Francisco by them.

20) The football match should not have been played in such bad weather.