31.In the densely ()part of the country， the problem of air pollution must be solved.

42.The food ()at the moment is for the dinner party.

41.()who she was， she said she was Mr.Johnson’s friend.

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.