He tried his best to comfort the injured passengers and told them help was ________.

下列句子运用的修辞手法与其他三项不同的一项是（ ）

t think your children could have been used tothe quick pace of life while working in Shenzhen, _____they—_____. They thought of returning to Changchun.

Today a lot of information can _____ online.

The teacher set such a difficult problem ________none of us could solve.