Ответ:

1. The parcel was delivered by him.

2. Children were being given flowers by Laura.

3. A new bacteria was discovered by this scientist.

4. The project has been being presented by them.

5. The furniture is being sold by him.

6. The carpets were being vacuumed by her.

7. The bikes are being ridden by us.

8. A dog is being walked by a boy.

9. She was woken up by her mother at 7 o'clock.

10. Some help had been being asked by David.