1. A sound of a violin is heard in the hall.
2. He is praised by his father when he works hard.
3. Bob is often taken for his brother by his sister. (Не уверен с этим)
4. I'm woken up by my mother at 7 o’clock every morning.
5. This room is used by us for special occasions.
6. In some districts pigs are used by farmers to find truffles.
7. These artificial flowers are made of silk.
8. The seals are fed at the zoo twice a day.
9. These dams are made by beavers.
10. Soft drinks are sold here.
11. Such things are opposed by most people.
12. A lot of work is usually done by students in spring.
13. Сhildren under sixteen are not admited.
14. These engines are now started by electricity.
15. It is never discussed by them in her presence.
Ex.1
Camping holiday in Germany was a mixed experience for Mary because there were both ups and downs. Mary didn`t like the rain, that prevented her from visiting the theme park, and crying of her baby brother, but she enjoyed swimming, playing football with the other kids and having a barbecue.
Ex.2
1. Mary`s dad had the idea to go to a theme park.
2. They didn`t go into the theme park because of the terrible rain.
3. They were going for a swim in the lake, playing some football and having a barbecue.
Ex.3
1. afterwards
2. until
3. by the time
4. before
5. the moment that
2. has been..previous summer and has gone
3. have discovered.. we have traveled
4. have thinked.. have liked
5. have been crossing