lice still haven’t found her, butthey’re doing all they _____.

下列各句中交际用语使用不得体的一项是（ ）

The police were seeking more information to find out ______ the rich merchant. [ ]

Tom’s farther, for ________life had once been very hard, got success later in his job.

Our bad living habits will destroy the earth. Only by changingwe live can we save the earth．