下列各句中，加线的成语使用恰当的一项是  （    ）

Do you want to go there on foot withme

I didn’t expect that John would be absent from my last Sunday’s birthday party.—As far as I know, he ______ to see his parents in the countryside on Sundays

Do you think it’s a good idea to make friends with your students?— _____ , I do I think it’s a great idea[ ]

The authors of computer viruses are geniuses.—I agreeIf they applied their wisdom to other net technology _____ human beings can benefit, it would be better