40. What do you think the government should do to help modern working mother?
41. I'll give him your message as soon as he phones.
42. You'll get a nice surprise the moment you open the front door.
43. We'll be dead by the time they find a cure for the cancer.
44. Linda had already opened the letters before she realized it was not addressed to her.
45. The building had almost burnt down by the time the fire brigade arrived.
47. Once my grandmother retires, He will travel around the world.
48. the sooner he stops smoking, the better he will feel.
49. mary might have forgotten the appointment.
50. After Mary had finished her homework, she went to bed.
51. Why don't you look up this word?
52. you mustn't cheat in the exams.
53. While I was listening t the radio, the power cut.
54. I may be late.
55. while I was having dinner, the doorbell rang.