从A、B、C、D四个选项中找出错项，并指出改正
61. This disappearance made it possible the rise of mammals on the earth.
       项应改为              
62. They mustn’t be at home, for the light is off.
      项应改为              
63. The reason for which he was absent yesterday was because his mother was ill in hospital.

      项应改为              
64. It wasn’t until I told them the truth which they began to understand what they had done.
      项应改为             
65. China is no longer what it used to, of whichwe Chinese are proud.
      项应改为             
66. The secret of his success lies in the full use he has made his time and energy in his study and work.
      项应改为             
67. What Tom said just now suggested that he shouldn’t agree to the plan.
      项应改为             
68. Which is known to us all, the earth moves around the sun.
      项应改为             
69. The day he had been looking forward to coming in time, which made him very happy.
      项应改为             
70. It is reported that two schools, both of them are being built in my hometown, will open next 
 
year.
      项应改为