1．________ the universe began with the “Big Bang” has been widely accepted.
答案：That
2．It has been proved ________ having a balanced diet helps to keep healthy.
答案：that
3．________we understand things has a lot to do with what we feel.
答案：How
4．________ is a fact that English is being accepted as an international language.
答案：It
5．________ made the parents proud was ________ their son had been admitted to a key university.
答案：What; that
6．I think ________ impresses me about his painting is the colours he uses.
答案：what
7．________ their flight will arrive on time is ________ they are concerned about.
答案：Whether; what
8．Steve Jobs has gone but ________ he has left behind is truly extraordinary.
答案：what
9．When and why he came here ________not known yet.
答案：is
