Past Simple or Past Continuous?

Past Simple or Past Continuous? 1. I was sitting on the bench for half an hourand then began reading a book. 2,Did you see him this morning? — Yes. Hestood in the hall laughing. 3, Hecame in and saw Nelly who was drawing astrange picture. 4. I did not understandwhat Mr Green was doing. 5. Nick and Freddrove along the road. 6. She sat thetable at six yesterday. 7. The business man flew to England yesterday. 8. Idid not hear what he said. I was typing atthe moment. 9. When did it happen? Ithappened when you were talking to yoursecretary. 10. We were walking in silence for5 minutes, then he spoke. 11. I toldhim he should not read while he was eating.12. The mouse hid while the catwas watching. 13. The train stroke anobstacle on the line, but it did not stopbecause it was travelling too fast at the time.14. I sat in my garden yesterday,when the servant came and saidthat a visitor was waiting for me in the hall.15. He did not like to play while otherswere working.