1 . Why are you so ______ (mystery)? Why don’t you tell me all the truth? (所给词的适当形式填空)

2 . He was being very________ (神秘的),and wouldn't tell me what he was up to. （根据汉语提示单词拼写）

3 . He believes people will be more likely to trust self-driving cars as they become more ______ features such as automatic braking or parking.

A．confused about

B．familiar with

C．passionate about

D．mysterious about