1. The secretary (work) on the reprt for more than three hours. She hopes she may finish it by the lunch time.
2. Please turn off the stove. The water (boil) for mor than fifteen minutes.
3. In the 19th century, it (take) two orw three months to cross North Americs by covered wagon. The trip (be) very rough and often dangerous
4. My granfather (have) a very exciting life. When he was young, he (live) on the farm in the countru, where there (be) a lot of cattle and meadowns 
5. Mary (work) on the essay for two hours now and she (hope)    that she (finish) it in one more hour.
6. I  (go) there once a long time ago and (not be)  back since
7. Those drivers (drive) for three hours when a heavy storm suddently (broke)
8. I (come) to visit you yesterday, but you (be not) at home
9. What (you/ doing) when the accident     ?
10. We (watch)TV when it (start) to rain