患者男性，35岁，出现局部隆起，红肿热痛明显，压之剧痛，有波动感，应首先考虑为()

A.丹毒

B.蜂窝织炎

C.脓肿

D.疥

E.痈

They are _____ in Shenzhen now, I think they must enjoy themselves.[ ]

A. on holiday  

B. on duty  

C. on business  

D. on watch