35. It was not until their teacher came that the boy stopped singing.
36. It was not until she received a letter from him that she wrote to him.
37. It was not until 2.30 that some one could leave the stadium.
38. It was not until midnight that I slept.
39. It was not until Lan was 35 that she went abroad.
40. It was not until midnight that we went to bed.