I hear the government is going to ___ the air quality with the new standard PM2.5，isn’t it—Yes, ___ the air pollution will get more serious.

This is the bike_______I lost last week.

Was it in 1997______he was still at middleschool_______ this boy became an expert at computer

He accepts the idea ______ successful people spend a lot more time reading than watching TV, and he has decided to read for an hour every day from now on.

What do you think of your math teacher– He is kind, he looks serious.