“谁知道”英语怎么说？

who knows：谁知道；谁知；艾薇儿；天晓得；谁懂。
Who knows what she looks like?
谁知道她长什么样子呢？
Who knows when we"ll meet again?
谁知何时能再相见！

Who knows. I wish I had a pretty
girlfriend.
谁知道呢，我要是有个漂亮的女朋友就好了。
There isn"t anyone who knows the
US people more than I do，Trump said.
没有人比我更了解美国人民，特朗普说。