Решение:
1. Presents are given at Christmas time.
2. The shop was robbed.
3. A concert will be given by The Rolling Stones next week.
4. The little boy had been seen playing in the park before he disappeared.
5. By whom was the food served?
6. Lunch is served from 12.00 to 2.00.
7. The first workbook will have been finished by the students by December.
8. Murder on the Orient Express was written by Agatha Christie.
9. A cake is being baked by Mum at the moment.