`11` The book  had been returnned to the library by Kathy.

`12`  Is that course taught by professor Jackson ? 

`13`  Is your house being painted by Mrs Brown ?

`14` That theory was destroyed by Doctor Ikeda .

`15`  The Washington Monument is visited by hundreds of people each day

`16`  Paper was invented by the Chinese , the main writing material today .

`17`  That picture was drawn bt Jim's daughter.

`18` A new roof was put last year.

`19` The dustbins are empited every Thurday .

`20`  Milk is delivered by her at about six o'clock

1. The book had been returned by Kathy to the library.

2. Is that course taught by professor Jackson.

3. Is your house being painted by Mrs Brown?

4.That theory was developed by Doctor Ikeda.

5.The small fishing village was destroyed by a storm

6.The Washington Monument is visited by hundreds of people every day

24. A new roof was put on last year

7.Paper, the main writing material were invented by the Chinese today

8.That picture was drawn by Jim's daughter

9.The dustbins are emptied every Thursday

10.Milk is delivered at about six o'clock