21. It (rain) __________ hard. We can’t do anything until it (stop) __________
22. Last night we (watch) __________TV when the power (fail) __________.
23. That evening we (stay) __________up to talk about the town where he (live) __________for some years.
24. I (sit) __________down for a rest while the shoes (repair) __________.
25. Half way to the office Paul (turn) __________round and (go) __________back home because he (forget) __________to turn the gas off.
26. London (change) __________a lot since we first (come) __________ to live here.
27. While we (talk) __________on the phone the children (start) __________fighting and (break) __________a window
28. He used to talk to us for hours about all the interesting things he (do) __________ in his life.
29. You know she (stand) __________looking at that picture for the last twenty minutes.
30. I (spend) __________ a lot of time travelling since I (get) __________this new job.