17)a rock band provided the for johns graduation party.(entetain) 18) all shops in my area have major sales twice .(year) 19)the most violent voicanic in the united states was that of mount st. helens in 1980. (erupt) 20) the battle of britain is a historical event of great for the british people.(significal) 21)you need to get from your supervisor. (permit) 22)the fire was thought to have been caused by a gas (explode)

1. When the taxi arrived I still was packing my things. 
2. What did you do in the evening yesterday? - I was watching TV and my wife was washing up.
3. I was doing all the exercises while you was sleeping.
4. Mr Brown , where were you when they were driving your car at midnight?
5. When the clock stroke nine she was running up the stairs to her office, because the lift did not work. 
6. He was standing and watching while the boys were fighting.
7. She wore a marvellous new dress at the party and it looked fantastic!
8. He was waiting for her for an hour but she never came.
9. When the telephone rang I was baking a cake and asking Mary, who was doing nothing at the moment to answer the call.
10. Why didn`t you attend the lecture on Saturday? Professor Brown spoke about UFO and other mysterious objects. 

Where was Kate going when you met her yesterday? 2. Every day the boss  enters the office at nine o'clock. 3. Yesterday the boss  entered the office at half past nine. 4. Did you have a PT lesson yesterday? — No, I didn't. 5. What did you buy at the shop yesterday? – I bought a book. 6. Yesterday my father did not read newspapers because he was very busy. He will read newspapers tomorrow. 7. Mother cooked a very tasty dinner yesterday. 8. Tomorrow Nick will not go to school. 9. Look! My friends are playing football.