依次填入下列各横线处的成语，最恰当的一组是( )①消防工作必须立足于 ，从提高公众的防火意识做起。②即使现有的产品畅销,也要 ，抓紧技术储备与新产品开发。③如果我们不从小事做起, ，那些细小的苗头最终可能酿成大祸。

students who killed themselves had only been moreconfident, their deaths ________.

I feel it is your husband who ________ for the spoiledchild.

The second half of his voyage was __________ dangerous part, during which he sailed round the Cape Horn.

e knocked at your door just now,but I didn’t see who was.