We haven’t heard from her for long, so we give her_____for dead.

With the word“PM2．5"_____ appearing in media reports，people pay greater attention to it and seek health tips for smoggy days．

The secret of his success is that he does everything___________．

(2013·大连24中模拟)Good health is the basis for students to ________ carry on with their studies and to do any other activity.

Although the country has had political independence for over a century,   it needs the support of its neighbors.