With the word “ PM2.5” _________ appearing in media reports, people pay greater attention to it and seek health tips for smoggy days.
students are required to take part in the boat race.
It is the test system,the teachers,that is to blame for the heavy burden of middle school students nowadays。
Having failed in many attempts,the bird managed to escape from the cage.
After several part – time jobs, he’s now got a job in a bank.
Since David ________ downloaded a virus into his computer, he can not open the file now.