9.They (study) in the library when the fire alarms went off. 10. It (snow) when I got up this morning. 11. Abert Einstein (die) in 1995. 12.Tom (go) to the post office twice yesterday. 13.Hellen (wait)in the lobby , wasn't she? 14.He (work) his way through college at that time. 15.He (teach ) economics at Harvard for almost 50 years. 16. The wind (blow) very hard when I went out this morning. 17. He fell while he (go) down the stairs. 18. My car (break)down this morning on the way to work. 19.Whe John (arrive) at home ,Anna (talk)to some one on the phone,John (start) to get the tea . 20.I (lie) in the bath when the phone (ring) ,It (stop) after a few rings. 21. It (be) cold when we (leave) the house that day ,and a light snow (fall) 22. Yesterday, I (go) to the restaurant with a client. 23 . We (drive) around the parking space. 24. When we ( arrive) at the restaurant, the place (be) full 25. The waitress (ask) us if we ( have) reservation. 26. I (say) "No my secretary for gets to make them". 27.The waitress ( tell) us to come back in two hours.