根据句意,用括号内所给单词的适当形式填空。
---How is your business going?
--- It couldn’t be _______ (bad).
Each of us _______ (breath) heavily after running on the playground every morning.
For everyone’s _______ (safe), we should always remember the law against driving after drinking.
Such a camera can help spacemen film _______ (they) during the flight.