依次填入下列各句横线处的成语，最恰当的一组是 ①特别是傍近铁路的河堤，更是牢固严实， ，简直连个蚂蚁洞的孔隙也没有给洪水留下。②我军万船齐发，攻破“千里江防”，很快就占领了蒋介石自以为防守得 的南京城。③潮汛已经过去了，大坝仍然屹立不动， 。

Do you want to be healthy ______. Smiling can help you stay healthy.

Can you see the notice there—- Yes, it ________ “No Smoking Here”.

. We would do more such exercises in the future, I think, ____we did yesterday.

We can’t do it that way — but whether it will work is ______ matter.