Wait till you are more . It’s better to be sure than sorry.
A. alternative
B. satisfied
C. optimistic
D. certain
网友回答
A. alternative
B. satisfied
C. optimistic
(答案→)D. certain
解析：词义考查题。alternative“二中择一的、交替的”；satisfied“感到满意的”；optimistic“乐观的”；certain“感到有把握的、确信的”。根据It’s better to be sure than sorry可知，答案应为D。