He promised not to tell anybody about my ____(秘密)。
(知识)is power.
It is necessary for us to ask questions _______(礼貌地).
Don’t leave your bike outside. Someone may _______(偷)it.
She knew the ____ (重要性) of working hard and not just to do what she enjoyed.
I couldn’t decide _____(是否) or not to go to the party.