60. The water can turn i__________________ steam(蒸汽) when it is heated.

59. This is the most i_____________ story I have ever heard.　

58. If you can’t go, let me go i__________________.

57. The i_______________ of our house has been painted recently.

56. Please write down this important sentence in red i_________________.

55. It’s a very large building i_________________.

54. Is your father i_______________? Sorry, he is out.

53. It’s the most i_______________ part of the job.

52. The sick man has been i_________________ for a long time.

51. I don’t know i______________ he will come. I____________ he comes, I will call on him.