what does he think of swimming?
He thinks it is amazing/boring/interesting/cool/dangerous/a lot of fun
What does she think of studying?
She thinks it is amazing/boring/interesting/cool/dangerous/a lot of fun
What do you think of singing?
I think it is amazing/boring/interesting/cool/dangerous/a lot of fun
What do they think of dancing?
They think it is amazing/boring/interesting/cool/dangerous/a lot of fun
What do you think of rock climbing?
I think it is amazing/boring/interesting/cool/dangerous/a lot of fun