1._______surprised us very much is that he had passed the exams.
A. What B. This C. It D. That
2. I know about this competition is that it is held every two years.
A.That B.What C.As D.How
3. that young babies learn to do things because certain acts lead to awards.
A.It is widely accepted B.What is widely accepted
C.Which is widely accepted D.That is widely accepted
4.Don’t you know that Australia was as a matter of fact used to be a nation of prisoners?
A.where B.what C.which D.that
