With the word “ PM2.5” ________ appearing in media reports, people pay greater attention to it and seek health tips for smoggy days.
He came all the way to China for learning it better ______ for making money.
Only when I left my parents for Italy ______ how much I loved them.
_____ the days and months went by, things were getting worse and worse.
My uncle’s house in the downtown area is much smaller than ours, but it is twice ______expensive.
We feel _____ our duty to make our country a better place.