Ответ:

1. Did you go to school yesterday? 2. He read an interesting book last month. 3. I looked for my keys but I didn’t find them. 4. I wasn’t hungry so I didn’t eat anything. 5. Did you speak to Fred yesterday? 6. Did you ring the bell? 7. What was that noise? I didn’t hear anything. 8. What did they have for breakfast? 9. How many books did you buy? 10. He opened his presents on Christmas morning. 11. I washed my clothes on Sunday afternoon.