No doubt ______ he knew the news.

1. A.
   that
2. B.
   if
3. C.
   whether
4. D.
   but

No doubt her husband could have told her, but he didn't ________．

1. A.
   choose
2. B.
   choose to
3. C.
   choose from
4. D.
   choose to do

_____ no doubt _____ the Amber Room is one of the wonders of the world.

A. It is; that      B. It is; whether

C. There is; that     D. There is; whether

_________ no doubt that a green campus plays an important role in the growth of students, both physically and mentally.

A. It is             B. There has      C. There is           D. It has

____________ no doubt that 100 years ago animal testing was cruel but today animals in experiments are very well taken care of.

         A. It is                                   B. There is                           C. This is                     D. That is