Don’t be worried about his safety he is an eighteen-year-old young man.A. In allB. After

问题补充：

Don’t be worried about his safety．, he is an eighteen-year-old young man.

A. In all

B. After all

C. Above all

D. First of all

答案：

A. In all

(答案→)B. After all

C. Above all

D. First of all

解析：本题的含义是不要担心他的安全，毕竟他是一个18岁的年轻人了，after all表示毕竟的意思，故本题选B。