根据句意和汉语注释，在答题卡标有题号的横线上，写出单词的正确形式。

小题1:You can never imagine how ________ (success) the event was held in Guangzhou last week.

小题2:To raise his family, he left home for work in his early _____________(twenty).

小题3:---How is your business going?---It couldn’t be _____________(bad).

小题4:The police have found some fingerprints. Maybe they belong to those ___________(rob)

生产经营单位对( )应当登记建档，定期检测、评估、监控，并制定应急预案，告知从业人员和相关人员应当采取的紧急措施。

A．故频发场所
B．重大事故隐患
C．大危险源
D．危险化学品仓库