Tìm lỗi sai và sửa

Tìm lỗi sai và sửa
I think I probably go on holiday when I finish my degree in economics in December
A.probably go 
B.when
C.finish 
D.degree in economics
A large meeting is going to be hold to promote sustainable development in all countries
A.is going to be hold 
B.to promote
C.sustainable development
D.all countries
The pollution of the forest has serious affected plant life and, to a lesser extent, widlife