Be _    . Make sure not to make the same spelling mistake next time.

The _____ news made us very _____.

All of us felt______when we heard the _____news.

—What do you think of the report about the air pollution on TV last night?—I think the situation is so        that we should take action to protect the environment.

Now the air in our city is ________ than it used to be．Something must be done to stop it．