1. I entered not knowing what to expect.
    我走进了妈妈的房间，不知道会发生什么。

2. It is quite exciting to hold the center of the national stage, with the audience not knowing whether to laugh or to weep.
    想想这一点，知道这一点都令人激动不已。占据国内舞台的中心可真刺激，而台下的观众则不知是喜是忧。