33.Every policeman and fireman ()on the alert， especially during public holidays.

40.()Sunday， the students are at home.

39.I apologize for ()my promise.

38.They found the lecture hard ().

37.She earns a good salary， so she ()be deep in debt.

36.My teacher was made ()his teaching because of poor health.

35.You don’t have to pay for your flights: they’re ()in the price of your holiday.

34.By the time we got to the cinema the film ()for half an hour.

33.The Browns ()here， but not any more.

32.Things might have been much worse if the mother ()on her right to keep the baby.

31.The conference ()a full week by the time it ends.