患者男，50岁，已诊断为慢性牙周炎，其治疗方案为首先进行基础治疗

第一阶段治疗结束后几周进入第二阶段治疗（）

A.1周

B.3周

C.4周

D.8周

E.12周

根据句意，用括号内所给单词的适当形式填空。

小题1:---How is your business going?

--- It couldn’t be _______ (bad).

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

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

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