1) Sure. We have so much to do together.
2) I think the new boy's name is Steve, but I'm not sure.
3) .... and be quite sure about it.
4) Is Jane sure of the facts?
5) I feel sure that....
6) Sure. I want to see the new film too.
7) ....but I'm not sure.
8) My dad is sure to know...
9) I'm not sure. I don't feel well.
10) Colin is sure to help you...