Ответ:
1. A new house was built last year.
2.Mickey Mouse was created by Walt Disney.
3. The new theme is being explained by the teacher.
4. Dinner is cooked by mom every day.
5. A letter will be sent in some minutes.
6. The task has already been finished.
7. The singers are being taught how to dance by the choreographer.
8. The new school will be opened by the Mayor.
Объяснение: