Filling a Large Mesh Hole

Right now I am working in Rhino and trying to modify this mesh that I have(I want to extend it outwards) I used gumball to do so, but now I have this issue of two holes that need to be patched in my mesh. I have tried a number of things to get this to be patched, but I still cant accomplish my goal and so I was wondering if anyone has any tips on here. The yellow areas are the two parts that need to be patched.

_FillMeshHole or _FillMeshHoles ?