Ответ:

1. Bread is eaten every day.

2. The letter was received yesterday.

3. Nick will be sent to Moscow next week.

4. I was asked at the lesson yesterday.

5. I was given a very interesting book at the library last Friday.

6. Not many houses are built in our town every year.

7. This work will be done tomorrow.

8. This text was translated at the last lesson.

9. These trees were planted last autumn.

10. A lot of interesting games are always played at our PT lessons.

11. This bone will be given to my dog tomorrow.

12. We were invited to a concert last Saturday.

13. Lost time is never found again.

1) is eaten

2) was received

3) will be sent

4) was asked

5) was given

6) are built

7) will be done

8) was translated

9) were planted

10) are played

11) will be given

12) were invited

13) is found (хотя лучше сказать lost time is never found, т.е мы never вставили между is и found)