英语选择1.Before the competition started ,Tom's friends believed

英语选择
1.Before the competition started ,Tom's friends believed hr was ___but he wasn't__.
A.sure to win;sure to success B.sure of success;sure of it C.sure to win ;sure about that D.sure about wining;sure to win
2.I wasn't sure why he had done it ,but I intended___.
A.of finding out B.for finding out C.by finding out D.to find out
3.The sportsman wants to set ___a new record in Olympic Games.
A.out B.down C.up D.in