Написать 3 предложения используя - was writing, was sitting, was having, bad bought, had flown, had started, sold, thought,understood

1.When the teacher came into the classroom, I was writing my homework which I could not to at home.

2. When the headmaster came into the classroom, everybody stood except me. I was sitting because I did not see her. I was busy with reading the lesson.

3. At that time I was having breakfast.

4. The old man who had bought the first turkey was standing quite near.

5. The birds had flown, and their empty nests were filled with snow.

6. The soldiers had started firing without orders.

7. I thought you sold the house.

8. I thought you passed the exam.

9. When he looked at me in that way, I understood that something was wrong.