11/ The boy screamed while the dentist was pulling out one of his teeth.
12/ The enemy used to attack the bay.
13/ The fire has destroyed many houses.
14/ The children are carrying the chairs into the house.
15/ They awarded him the Nobel Prize for medicine in 1946.
16/ We saw him leave the office at 6 o’clock this morning.
17/ My parents didn’t let me go to school this morning because I was ill.
18/ You ought to water these plants once a week.
19/ People saw her driving a car near the bridge.
20/ They said that he was the richest man in the town.
21/ Scientists began to carry out researches on AIDS in 1981.
22/ The boy knew that they were praising him.
23/ Everybody believed that he had died of lung cancer.
24/ They hadn’t built the bridge when we first came here.
25/ I can assure you that I will arrange everything in time.