With the word PM 2.5 ________ appearing in media reports, people pay greater attention to it and seek health tips for smoggy days.

A. immediately B. consequently

C. permanently D. constantly

Just as Tu Youyou once commented, “In order to make some achievements and ______ yourself in your field, there are certain things you must do.”

A. bury B. promote

C. distinguish D. behave

—Could you say something about Turkey’s downing of the Russian fighter jet?

—Sorry. It ______ by a group of experts and will be made clear the moment they get the answer.

A. has been investigated B. is being investigated

C. was investigated D. was being investigated

Common sense requires us to get away from the concept that national boundaries are frontiers _________ knowledge may not spread.

A. with which B. across with

C. through which D. from which

David will succeed along the career ladder one day, I firmly believe, _______ he devote more energy to it.

A. might B. would C. could D. should

Meeting again by chance, Lucy and Amy are delighted to _______ the friendship where it left out years ago.

A. set up B. build up

C. bring up D. pick up

—Professor Smith, I’d like to take a gap year to Africa to serve in a global anti-Aids campaign.

—Good idea, ______ you can afford the time.

A. provided that B. in case

C. even if D. so that

—Why did Miss Li resign from the present position so abruptly?

—As far as I know, she _______ for higher wages, but was turned down in the end.

A. broke off B. gave away

C. went on D. held out

People are always coming in here borrowing my hammer, you know, to fix a cart wheel or ______.

A. anything B. something

C. everything D. nothing

With a view to fighting against crimes online, the authority hosted an anti-piracy concert with over 100 pop singers, _______ fans not to buy pirated music and movies.

A. urging B. to urge

C. having urged D. urged