I think doing sports is great --------(fun)

I think doing sports is great --------(fun) I think it is a great fun.改错) i think (playing)is (不填）great fun Hiking is ___ in spring,I think.A.a great fun B.great fun C. i think Halloween is __for children A a great fun B great fu I think living in the countryside is _ A.a great fun B.great I think doing sports （ ）our health 选择 I think ______ is _____ great fun.A.play the cards,a B.pl 选择 I think ______ is ______ great fun.A.play the cards,a B.p i think he is doing sports right now（改为否定句） think与great fun it is great fun +doing还是to do