她神秘地笑了笑，说：'也许吧，也许不是。'

She smiled ___mysteriously and said, 'Perhaps, and perhaps not.'

神秘的是，灯亮了，尽管开关附近没有人。

___Mysteriously, the light came on, although no one was near the switch.

神秘的是，主角消失得无影无踪。

___Mysteriously, the main character vanished without a trace.