题目内容：

根据句意，用括号内所给单词的适当形式填空。

1.---How is your business going?

--- It couldn’t be _______ (bad).

2.Each of us _______ (breath) heavily after running on the playground every morning.

3.For everyone’s _______ (safe), we should always remember the law against driving after drinking.

4.Such a camera can help spacemen film _______ (they) during the flight.