■ kill

不一定是“杀死”（中文“杀死”的主语总是人），可以用被动语气泛指“死于非命”。

• His father was killed last year in a traffic accident.他父亲去年死于交通事故（不能说“被杀死”）。

• oil
• old
• on
• on
• on a first-name basis
• once
• one
• one
• one in
• one in 与 one out of
• one of
• one out of
• one-sided
• one 与 a
• on high
• on life support
• only
• only
• only
• only 与 alone
• on the air
• on the air...
• on the part of
• open
• open 与 close