Open the brackets use passive forms

I. Open the brackets, use Passive forms

1. Boat races between the Universities of Oxford and Cambridge (have been taken place) since 1820.

2. Scotland (is known) to be motherland of golf.

3. How many houses a year (are built) in our city?

4. Why aren't these exercises (done) ?

5. I'm afraid we (are being waited) for.

6. The film (is being shown) from five till seven.

7. This book (will be published) next month.

8. His new film (was staged) last month.

9. The letter (will be posted) tomorrow.

10. Margaret (is known) to be a very industrious person.