问题补充：
Successful people have some good qualities and above all, they are never a simple life so they keep fighting until they become top ones.
A. content with
B. curious about
C. interested in
D. confident in
答案：
(答案→)A. content with
B. curious about
C. interested in
D. confident in
解析：be content with对..满意；be curious about对…好奇；be interested in 对…感兴趣；be confident in在..方面有信心；句义：成功人士有很多的特点，最重要的是他们从来不对简单的生活感到满意，所以他们继续奋斗直到他们成为更成功的人。根据句义说明A正确。
